|  | reflex::StdPosixMatcher Class Reference updated Thu Jun 19 2025 by Robert van Engelen |

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reflex::StdPosixMatcher Class Reference

std matcher engine class, extends reflex::StdMatcher for POSIX ERE std::regex::awk syntax and regex matching. More...

`#include <stdmatcher.h>`

Inheritance diagram for reflex::StdPosixMatcher:
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Collaboration diagram for reflex::StdPosixMatcher:
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## Public Member Functions
| StdPosixMatcher ()
| Default constructor. More...
| StdPosixMatcher (const char *pattern, const Input &input=Input(), const char *opt=NULL)
| Construct a POSIX matcher engine from a string regex pattern and an input character sequence. More...
| StdPosixMatcher (const std::string &pattern, const Input &input=Input(), const char *opt=NULL)
| Construct a POSIX ERE matcher engine from a string regex pattern and an input character sequence. More...
| StdPosixMatcher (const Pattern &pattern, const Input &input=Input(), const char *opt=NULL)
| Construct a matcher engine from a std::regex pattern and an input character sequence. More...
virtual PatternMatcher & | pattern (const Pattern &pattern) REFLEX_OVERRIDE
| Set the pattern to use with this matcher (the given pattern is shared and must be persistent), fails when a non-POSIX ERE std::regex is given. More...
virtual PatternMatcher & | pattern (const Pattern *pattern) REFLEX_OVERRIDE
| Set the pattern to use with this matcher (the given pattern is shared and must be persistent), fails when a non-POSIX ERE std::regex is given. More...
virtual PatternMatcher & | pattern (const char *pattern) REFLEX_OVERRIDE
| Set the pattern from a regex string to use with this matcher. More...
virtual PatternMatcher & | pattern (const std::string &pattern) REFLEX_OVERRIDE
| Set the pattern from a regex string to use with this matcher. More...
Public Member Functions inherited from reflex::StdMatcher
| StdMatcher ()
| Default constructor. More...
template<typename P >
| StdMatcher (const P *pattern, const Input &input=Input(), const char *opt=NULL)
| Construct matcher engine from a std::regex object or string regex, and an input character sequence. More...
template<typename P >
| StdMatcher (const P &pattern, const Input &input=Input(), const char *opt=NULL)
| Construct matcher engine from a std::regex object or string regex, and an input character sequence. More...
| StdMatcher (const StdMatcher &matcher)
| Copy constructor. More...
StdMatcher & | operator= (const StdMatcher &matcher)
| Assign a matcher. More...
virtual StdMatcher * | clone () REFLEX_OVERRIDE
| Polymorphic cloning. More...
virtual void | reset (const char *opt=NULL) REFLEX_OVERRIDE
| Reset this matcher's state to the initial state and when assigned new input. More...
virtual PatternMatcher & | pattern (const StdMatcher &matcher)
| Set the pattern to use with this matcher as a shared pointer to another matcher pattern. More...
virtual PatternMatcher & | pattern (const Pattern *pattern) REFLEX_OVERRIDE
| Set the pattern to use with this matcher (the given pattern is shared and must be persistent), overrides the ECMA/POSIX/AWK syntax option. More...
virtual PatternMatcher & | pattern (const Pattern &pattern) REFLEX_OVERRIDE
| Set the pattern to use with this matcher (the given pattern is shared and must be persistent), overrides the ECMA/POSIX/AWK syntax option. More...
virtual std::pair< const char *, size_t > | operator[] (size_t n) const REFLEX_OVERRIDE
| Returns captured text as a std::pair<const char*,size_t> with string pointer (non-0-terminated) and length. More...
virtual std::pair< size_t, const char * > | group_id () REFLEX_OVERRIDE
| Returns the group capture identifier containing the group capture index >0 and name (or NULL) of a named group capture, or (1,NULL) by default. More...
virtual std::pair< size_t, const char * > | group_next_id () REFLEX_OVERRIDE
| Returns the next group capture identifier containing the group capture index >0 and name (or NULL) of a named group capture, or (0,NULL) when no more groups matched. More...
Public Member Functions inherited from reflex::PatternMatcher< std::regex >
| PatternMatcher (const PatternMatcher &matcher)
| Copy constructor, the underlying pattern object is shared (not deep copied). More...
virtual | ~PatternMatcher ()
| Delete matcher, deletes pattern when owned. More...
virtual PatternMatcher & | operator= (const PatternMatcher &matcher)
| Assign a matcher, the underlying pattern object is shared (not deep copied). More...
virtual PatternMatcher & | pattern (const PatternMatcher &matcher)
| Set the pattern to use with this matcher as a shared pointer to another matcher pattern. More...
virtual const Pattern & | pattern () const
| Returns a reference to the pattern object associated with this matcher. More...
bool | has_pattern () const
| Returns true if this matcher has a pattern. More...
bool | own_pattern () const
| Returns true if this matcher has its own pattern not received from another matcher (responsible to delete). More...
Public Member Functions inherited from reflex::AbstractMatcher
| AbstractMatcher (const Input &input, const char *opt)
| Construct a base abstract matcher. More...
| AbstractMatcher (const Input &input, const Option &opt)
| Construct a base abstract matcher. More...
virtual | ~AbstractMatcher ()
| Delete abstract matcher, deletes this matcher's internal buffer. More...
bool | buffer (size_t blk=0)
| Set buffer block size for reading: use 0 (or omit argument) to buffer all input in which case returns true if all the data could be read and false if a read error occurred. More...
void | set_handler (Handler *handler)
| Set event handler functor to invoke when the buffer contents are shifted out, e.g. for logging the data searched. More...
void | handle ()
| Invoke handler explicitly (externally) with zero shift distance. More...
void | set_reserve (size_t n)
| Set reserved bytes for buffer shifting. More...
Context | before ()
| Get the buffered context before the matching line. More...
Context | after ()
| Get the buffered context after EOF is reached. More...
void | interactive ()
| Set interactive input with buffer size of 1 to read data bytewise which is very slow. More...
void | flush ()
| Flush and delete the buffer's remaining content. More...
virtual size_t | get (char *s, size_t n)
| Returns more input data directly from the source (method can be overriden, as by reflex::FlexLexer::get(s, n) for example that invokes reflex::FlexLexer::LexerInput(s, n)). More...
virtual bool | wrap ()
| Returns true if wrapping of input after EOF is supported. More...
virtual AbstractMatcher & | input (const Input &input)
| Set the input character sequence for this matcher and reset/restart the matcher. More...
AbstractMatcher & | buffer (char *base, size_t size)
| Set the buffer base containing 0-terminated character data to scan in place (data may be modified), reset/restart the matcher. More...
size_t | matches ()
| Returns nonzero capture index (i.e. true) if the entire input matches this matcher's pattern (and internally caches the true/false result to permit repeat invocations). More...
size_t | accept () const
| Returns a positive integer (true) indicating the capture index of the matched text in the pattern or zero (false) for a mismatch. More...
const char * | begin () const
| Returns pointer to the begin of the matched text (non-0-terminated), a constant-time operation, use with end() or use size() for text end/length. More...
const char * | end () const
| Returns pointer to the exclusive end of the matched text, a constant-time operation. More...
const char * | text ()
| Returns 0-terminated pattern match as a char pointer, does not include matched \0s, this is a constant-time operation. More...
std::string | str () const
| Returns the text matched as a string, a copy of text(), may include pattern-matched \0s. More...
std::wstring | wstr () const
| Returns the pattern match as a wide string, converted from UTF-8 text(), may include pattern-matched \0s. More...
size_t | size () const
| Returns the length of the matched text in number of bytes, including pattern-matched \0s, a constant-time operation. More...
size_t | wsize () const
| Returns the length of the matched text in number of wide characters. More...
int | chr () const
| Returns the first 8-bit character of the text matched. More...
int | wchr () const
| Returns the first wide character of the text matched. More...
void | lineno_skip (bool f=false)
| Set or reset mode to count matching lines only and skip all other (e.g. for speed). More...
void | lineno (size_t n)
| Set or change the starting line number of the last match. More...
size_t | lineno ()
| Updates and returns the starting line number of the match in the input character sequence. More...
size_t | lines ()
| Returns the number of lines that the match spans. More...
size_t | lineno_end ()
| Returns the inclusive ending line number of the match in the input character sequence. More...
void | columno (size_t n)
| Set or change the starting column number of the last match. More...
size_t | columno ()
| Updates and returns the starting column number of the matched text, taking tab spacing into account and counting wide characters as one character each. More...
size_t | columns ()
| Returns the number of columns of the matched text, taking tab spacing into account and counting wide characters as one character each. More...
size_t | columno_end ()
| Returns the inclusive ending column number of the matched text on the ending matching line, taking tab spacing into account and counting wide characters as one character each. More...
std::pair< size_t, std::string > | pair () const
| Returns std::pair<size_t,std::string>(accept(), str()), useful for tokenizing input into containers of pairs. More...
std::pair< size_t, std::wstring > | wpair () const
| Returns std::pair<size_t,std::wstring>(accept(), wstr()), useful for tokenizing input into containers of pairs. More...
size_t | first () const
| Returns the position of the first character of the match in the input character sequence, a constant-time operation. More...
size_t | last () const
| Returns the exclusive position of the last character of the match in the input character sequence, a constant-time operation. More...
bool | at_bob () const
| Returns true if this matcher is at the start of a buffer to read an input character sequence. Use reset() to restart reading new input. More...
void | set_bob (bool bob)
| Set/reset the begin of a buffer state. More...
bool | at_end ()
| Returns true if this matcher has no more input to read from the input character sequence. More...
bool | hit_end () const
| Returns true if this matcher hit the end of the input character sequence. More...
void | set_end (bool eof)
| Set and force the end of input state. More...
bool | at_bol () const
| Returns true if this matcher reached the begin of a new line. More...
void | set_bol (bool bol)
| Set/reset the begin of a new line state. More...
bool | at_bow ()
| Returns true if this matcher matched text that begins an ASCII word. More...
bool | at_eow ()
| Returns true if this matcher matched text that ends an ASCII word. More...
int | input ()
| Returns the next 8-bit character (unsigned char 0..255 or EOF) from the input character sequence, while preserving the current text() match (but pointer returned by text() may change; warning: does not preserve the yytext string pointer when options –flex and –bison are used). More...
int | winput ()
| Returns the next wide character (unsigned 0..U+10FFFF or EOF) from the input character sequence, while preserving the current text() match (but pointer returned by text() may change; warning: does not preserve the yytext string pointer when options –flex and –bison are used). More...
void | unput (char c)
| Put back one character (8-bit) on the input character sequence for matching, DANGER: invalidates the previous text() pointer and match info, unput is not honored when matching in-place using buffer(base, size) and nothing has been read yet. More...
void | wunput (int c)
| Put back one (wide) character on the input character sequence for matching, DANGER: invalidates the previous text() pointer and match info, unput is not honored when matching in-place using buffer(base, size) and nothing has been read yet. More...
int | peek ()
| Peek at the next character available for reading from the current input source. More...
const char * | bol ()
| Returns pointer to the begin of the line in the buffer containing the matched text. More...
const char * | eol (bool inclusive=false)
| Returns pointer to the end of the line (last char + 1) in the buffer containing the matched text, DANGER: invalidates previous bol() and text() pointers, use eol() before bol(), text(), begin(), and end() when those are used. More...
const char * | aft (size_t len)
| Return pointer to the end of the match + len after, or at end of file, DANGER: invalidates previous bol() and text() pointers, use aft() before bol(), text(), begin(), and end() when those are used. More...
const char * | bef (size_t len)
| Return pointer to the begin of the match - len before, or at the begin of the file. More...
size_t | fetch (size_t len)
| Return number of bytes available given number of bytes to fetch ahead, limited by input size and buffer size, DANGER: invalidates previous bol() and text() pointers, use fetch() before bol(), text(), begin(), and end() when those are used. More...
size_t | avail ()
| Returns the number of bytes in the buffer available to search from the current begin()/text() position. More...
size_t | border ()
| Returns the byte offset of the match from the start of the line. More...
const char * | span ()
| Enlarge the match to span the entire line of input (excluding ), return text(). More...
std::string | line ()
| Returns the line of input (excluding ) as a string containing the matched text as a substring. More...
std::wstring | wline ()
| Returns the line of input (excluding ) as a wide string containing the matched text as a substring. More...
bool | skip (char c)
| Skip input until the specified ASCII character is consumed and return true, or EOF is reached and return false. More...
bool | skip (wchar_t c)
| Skip input until the specified Unicode character is consumed and return true, or EOF is reached and return false. More...
bool | skip (const char *s)
| Skip input until the specified literal UTF-8 string is consumed and return true, or EOF is reached and return false. More...
const char * | rest ()
| Fetch the rest of the input as text, useful for searching/splitting up to n times after which the rest is needed. More...
void | more ()
| Append the next match to the currently matched text returned by AbstractMatcher::text, when the next match found is adjacent to the current match. More...
void | less (size_t n)
| Truncate the AbstractMatcher::text length of the match to n characters in length and reposition for next match. More...
| operator size_t () const
| Cast this matcher to positive integer indicating the nonzero capture index of the matched text in the pattern, same as AbstractMatcher::accept. More...
| operator std::string () const
| Cast this matcher to a std::string of the text matched by this matcher. More...
| operator std::wstring () const
| Cast this matcher to a std::wstring of the text matched by this matcher. More...
| operator std::pair< size_t, std::string > () const
| Cast the match to std::pair<size_t,std::wstring>(accept(), wstr()), useful for tokenization into containers. More...
bool | operator== (const char *rhs) const
| Returns true if matched text is equal to a string, useful for std::algorithm. More...
bool | operator== (const std::string &rhs) const
| Returns true if matched text is equalt to a string, useful for std::algorithm. More...
bool | operator== (size_t rhs) const
| Returns true if capture index is equal to a given size_t value, useful for std::algorithm. More...
bool | operator== (int rhs) const
| Returns true if capture index is equal to a given int value, useful for std::algorithm. More...
bool | operator!= (const char *rhs) const
| Returns true if matched text is not equal to a string, useful for std::algorithm. More...
bool | operator!= (const std::string &rhs) const
| Returns true if matched text is not equal to a string, useful for std::algorithm. More...
bool | operator!= (size_t rhs) const
| Returns true if capture index is not equal to a given size_t value, useful for std::algorithm. More...
bool | operator!= (int rhs) const
| Returns true if capture index is not equal to a given int value, useful for std::algorithm. More...
void | tabs (char n)
| Set tab size 1, 2, 4, or 8. More...
char | tabs ()
| Returns current tab size 1, 2, 4, or 8. More...

## Static Public Member Functions
template<typename T >
static std::string | convert (T regex, convert_flag_type flags=convert_flag::none, bool *multiline=NULL)
| Convert a regex to an acceptable form, given the specified regex library signature `"[decls:]escapes[?+]"`, see reflex::convert. More...
Static Public Member Functions inherited from reflex::StdMatcher
template<typename T >
static std::string | convert (T regex, convert_flag_type flags=convert_flag::none, bool *multiline=NULL)
| Convert a regex to an acceptable form, given the specified regex library signature `"[decls:]escapes[?+]"`, see reflex::convert. More...

## Additional Inherited Members
Public Types inherited from reflex::PatternMatcher< std::regex >
typedef std::regex | Pattern
Public Types inherited from reflex::AbstractMatcher
typedef AbstractMatcher::Iterator< AbstractMatcher > | iterator
| std::input_iterator for scanning, searching, and splitting input character sequences More...
typedef AbstractMatcher::Iterator< const AbstractMatcher > | const_iterator
Public Attributes inherited from reflex::AbstractMatcher
Operation | scan
| functor to scan input (to tokenize input) More...
Operation | find
| functor to search input More...
Operation | split
| functor to split input More...
Input | in
| input character sequence being matched by this matcher More...
Protected Types inherited from reflex::AbstractMatcher
typedef int | Method
| a method is one of Const::SCAN, Const::FIND, Const::SPLIT, Const::MATCH More...
Protected Member Functions inherited from reflex::StdMatcher
virtual size_t | match (Method method) REFLEX_OVERRIDE
| The match method Const::SCAN, Const::FIND, Const::SPLIT, or Const::MATCH, implemented with std::regex. More...
void | new_itr (Method method)
| Create a new std::regex iterator to (continue to) advance over input. More...
Protected Member Functions inherited from reflex::PatternMatcher< std::regex >
| PatternMatcher (const Pattern *pattern=NULL, const Input &input=Input(), const char *opt=NULL)
| Construct a base abstract matcher from a pointer to a persistent pattern object (that is shared with this class) and an input character sequence. More...
| PatternMatcher (const Pattern &pattern, const Input &input=Input(), const char *opt=NULL)
| Construct a base abstract matcher from a persistent pattern object (that is shared with this class) and an input character sequence. More...
| PatternMatcher (const char *pattern, const Input &input=Input(), const char *opt=NULL)
| Construct a base abstract matcher from a regex pattern string and an input character sequence. More...
| PatternMatcher (const std::string &pattern, const Input &input=Input(), const char *opt=NULL)
| Construct a base abstract matcher from a regex pattern string and an input character sequence. More...
Protected Member Functions inherited from reflex::AbstractMatcher
virtual void | init (const char *opt=NULL)
| Initialize the base abstract matcher at construction. More...
bool | grow (size_t need=Const::BLOCK)
| Shift or expand the internal buffer when it is too small to accommodate more input, where the buffer size is doubled when needed, change cur_, pos_, end_, max_, ind_, buf_, bol_, lpb_, and txt_. More...
int | get ()
| Returns the next character read from the current input source. More...
void | reset_text ()
| Reset the matched text by removing the terminating \0 when applicable, which is needed to search for a new match. More...
void | set_current (size_t loc)
| Set the current position in the buffer for the next match. More...
void | set_current_and_peek_more (size_t loc)
| Set the current match position in the buffer and peek for more text, allows large buffer shifts that aren't pinned to txt_. More...
int | get_more ()
| Get the next character and grow the buffer to make more room if necessary, unless EOF. More...
int | peek_more ()
| Peek at the next character and grow the buffer to make more room if necessary, unless EOF. More...
Protected Attributes inherited from reflex::StdMatcher
std::regex_constants::match_flag_type | flg_
| std::regex match flags More...
std::cregex_iterator | itr_
| const std::regex iterator More...
std::cregex_iterator | fin_
| const std::regex iterator final end More...
size_t | grp_
| last group index for group_next_id() More...
Protected Attributes inherited from reflex::PatternMatcher< std::regex >
const Pattern * | pat_
| points to the pattern object used by the matcher More...
bool | del_
| true if PatternMatcher::pat_ was allocated and should be deleted More...
Protected Attributes inherited from reflex::AbstractMatcher
Option | opt_
| options for matcher engines More...
char * | buf_
| input character sequence buffer More...
char * | txt_
| points to the matched text in buffer AbstractMatcher::buf_ More...
size_t | len_
| size of the matched text More...
size_t | cap_
| nonzero capture index of an accepted match or zero More...
size_t | cur_
| next position in AbstractMatcher::buf_ to assign to AbstractMatcher::txt_ More...
size_t | pos_
| position in AbstractMatcher::buf_ after AbstractMatcher::txt_ More...
size_t | end_
| ending position of the input buffered in AbstractMatcher::buf_ More...
size_t | max_
| total buffer size and max position + 1 to fill More...
size_t | ind_
| current indent position More...
size_t | blk_
| block size for block-based input reading, as set by AbstractMatcher::buffer More...
int | got_
| last unsigned character we looked at (to determine anchors and boundaries) More...
int | chr_
| the character located at AbstractMatcher::txt_[AbstractMatcher::len_] More...
const char * | bol_
| begin of line pointer in buffer More...
Handler * | evh_
| event handler functor to invoke when buffer contents are shifted out More...
const char * | lpb_
| line pointer in buffer, updated when counting line numbers with lineno() More...
size_t | lno_
| line number count (cached) More...
const char * | cpb_
| column pointer in buffer, updated when counting column numbers with columno() More...
size_t | cno_
| column number count (cached) More...
size_t | num_
| character count of the input till bol_ More...
size_t | res_
| reserve bytes to keep in the buffer before bol_ when shifting More...
bool | own_
| true if AbstractMatcher::buf_ was allocated and should be deleted More...
bool | eof_
| input has reached EOF More...
bool | mat_
| true if AbstractMatcher::matches() was successful More...
bool | cml_
| true when counting matching lines instead of line numbers More...

## Detailed Description

std matcher engine class, extends reflex::StdMatcher for POSIX ERE std::regex::awk syntax and regex matching.

std::regex with POSIX ERE std::regex::awk.

## Constructor & Destructor Documentation

reflex::StdPosixMatcher::StdPosixMatcher | ( |  | ) |
| inline

Default constructor.

reflex::StdPosixMatcher::StdPosixMatcher | ( | const char * | pattern,
|  | const Input & | input = `Input()`,
|  | const char * | opt = `NULL`
| ) |  |
| inline

Construct a POSIX matcher engine from a string regex pattern and an input character sequence.

Parameters

  pattern | a string regex for this matcher
  input | input character sequence for this matcher
  opt | option string of the form `(A|N|T(=[[:digit:]])?|;)*`

reflex::StdPosixMatcher::StdPosixMatcher | ( | const std::string & | pattern,
|  | const Input & | input = `Input()`,
|  | const char * | opt = `NULL`
| ) |  |
| inline

Construct a POSIX ERE matcher engine from a string regex pattern and an input character sequence.

Parameters

  pattern | a string regex for this matcher
  input | input character sequence for this matcher
  opt | option string of the form `(A|N|T(=[[:digit:]])?|;)*`

reflex::StdPosixMatcher::StdPosixMatcher | ( | const Pattern & | pattern,
|  | const Input & | input = `Input()`,
|  | const char * | opt = `NULL`
| ) |  |
| inline

Construct a matcher engine from a std::regex pattern and an input character sequence.

Parameters

  pattern | a std::regex for this matcher
  input | input character sequence for this matcher
  opt | option string of the form `(A|N|T(=[[:digit:]])?|;)*`

## Member Function Documentation

template<typename T >

static std::string reflex::StdPosixMatcher::convert | ( | T | regex,
|  | convert_flag_type | flags = `convert_flag::none`,
|  | bool * | multiline = `NULL`
| ) |  |
| inline static

Convert a regex to an acceptable form, given the specified regex library signature `"[decls:]escapes[?+]"`, see reflex::convert.

virtual PatternMatcher& reflex::StdPosixMatcher::pattern | ( | const Pattern & | pattern | ) |
| inline virtual

Set the pattern to use with this matcher (the given pattern is shared and must be persistent), fails when a non-POSIX ERE std::regex is given.

Returns
  this matcher.

Parameters

  pattern | std::regex for this matcher

Reimplemented from reflex::PatternMatcher< std::regex >.

virtual PatternMatcher& reflex::StdPosixMatcher::pattern | ( | const Pattern * | pattern | ) |
| inline virtual

Set the pattern to use with this matcher (the given pattern is shared and must be persistent), fails when a non-POSIX ERE std::regex is given.

Returns
  this matcher.

Parameters

  pattern | std::regex for this matcher

Reimplemented from reflex::PatternMatcher< std::regex >.

virtual PatternMatcher& reflex::StdPosixMatcher::pattern | ( | const char * | pattern | ) |
| inline virtual

Set the pattern from a regex string to use with this matcher.

Returns
  this matcher.

Parameters

  pattern | regex string to instantiate internal pattern object

Reimplemented from reflex::StdMatcher.

virtual PatternMatcher& reflex::StdPosixMatcher::pattern | ( | const std::string & | pattern | ) |
| inline virtual

Set the pattern from a regex string to use with this matcher.

Returns
  this matcher.

Parameters

  pattern | regex string to instantiate internal pattern object

Reimplemented from reflex::StdMatcher.

The documentation for this class was generated from the following file:

- stdmatcher.h