regex.h(3head) [centos man page]

regex.h(3HEAD)                                                        Headers                                                       regex.h(3HEAD)

NAME

       regex.h, regex - regular expression matching types

SYNOPSIS

       #include <regex.h>

DESCRIPTION

       The  <regex.h>  header defines the structures and symbolic constants used by the regcomp(), regexec(), regerror(), and regfree() functions.
       See regcomp(3C).

       The structure type regex_t contains the following member:

       size_t re_nsub     number of parenthesized subexpressions

       The type size_t is defined as described in <sys/types.h>. See types.h(3HEAD).

       The type regoff_t is defined as a signed integer type that can hold the largest value that can be stored in either a  type  off_t  or  type
       ssize_t. The structure type regmatch_t contains 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

       Values for the cflags parameter to the regcomp function are as follows:

       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 character

       Values for the eflags parameter to the regexec() function are as follows:

       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 following constants are defined 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 '' in pattern.

       REG_ESUBREG     Number in fIdigit 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.

       REG_ENOSYS      Reserved.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Interface Stability          |Standard                     |
       +-----------------------------+-----------------------------+

SEE ALSO

       regcomp(3C), types.h(3HEAD), attributes(5), standards(5)

SunOS 5.10                                                          9 Sep 2004                                                      regex.h(3HEAD)