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PROLOG | NAME | SYNOPSIS | DESCRIPTION | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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regex.h(0P) POSIX Programmer's Manual regex.h(0P)
This manual page is part of the POSIX Programmer's Manual. The
Linux implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
regex.h — regular expression matching types
#include <regex.h>
The <regex.h> header shall define the structures and symbolic
constants used by the regcomp(), regexec(), regerror(), and
regfree() functions.
The <regex.h> header shall define the regex_t structure type,
which shall include at least the following member:
size_t re_nsub Number of parenthesized subexpressions.
The <regex.h> header shall define the size_t type as described in
<sys/types.h>.
The <regex.h> header shall define the regoff_t type as a signed
integer type that can hold the largest value that can be stored
in either a ptrdiff_t type or a ssize_t type.
The <regex.h> header shall define the regmatch_t structure type,
which shall include at least the following members:
regoff_t rm_so Byte offset from start of string
to start of substring.
regoff_t rm_eo Byte offset from start of string of the
first character after the end of substring.
The <regex.h> header shall define the following symbolic
constants for the cflags parameter to the regcomp() function:
REG_EXTENDED Use Extended Regular Expressions.
REG_ICASE Ignore case in match.
REG_NOSUB Report only success or fail in regexec().
REG_NEWLINE Change the handling of <newline>.
The <regex.h> header shall define the following symbolic
constants for the eflags parameter to the regexec() function:
REG_NOTBOL The <circumflex> character ('^'), when taken as a
special character, does not match the beginning of
string.
REG_NOTEOL The <dollar-sign> ('$'), when taken as a special
character, does not match the end of string.
The <regex.h> header shall define the following symbolic
constants as error return values:
REG_NOMATCH regexec() failed to match.
REG_BADPAT Invalid regular expression.
REG_ECOLLATE Invalid collating element referenced.
REG_ECTYPE Invalid character class type referenced.
REG_EESCAPE Trailing <backslash> character in pattern.
REG_ESUBREG Number in \digit invalid or in error.
REG_EBRACK "[]" imbalance.
REG_EPAREN "\(\)" or "()" imbalance.
REG_EBRACE "\{\}" imbalance.
REG_BADBR Content of "\{\}" invalid: not a number, number too
large, more than two numbers, first larger than
second.
REG_ERANGE Invalid endpoint in range expression.
REG_ESPACE Out of memory.
REG_BADRPT '?', '*', or '+' not preceded by valid regular
expression.
The following shall be declared as functions and may also be
defined as macros. Function prototypes shall be provided.
int regcomp(regex_t *restrict, const char *restrict, int);
size_t regerror(int, const regex_t *restrict, char *restrict, size_t);
int regexec(const regex_t *restrict, const char *restrict, size_t,
regmatch_t [restrict], int);
void regfree(regex_t *);
The implementation may define additional macros or constants
using names beginning with REG_.
The following sections are informative.
None.
None.
None.
sys_types.h(0p)
The System Interfaces volume of POSIX.1‐2017, regcomp(3p)
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. In the event of any
discrepancy between this version and the original IEEE and The
Open Group Standard, the original IEEE and The Open Group
Standard is the referee document. The original Standard can be
obtained online at http://www.opengroup.org/unix/online.html .
Any typographical or formatting errors that appear in this page
are most likely to have been introduced during the conversion of
the source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2017 regex.h(0P)
Pages that refer to this page: regcomp(3p)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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