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.TH REGEX.H 3HEAD "Sep 9, 2004"
.SH NAME
regex.h, regex \- regular expression matching types
.SH SYNOPSIS
.LP
.nf
#include <\fBregex.h\fR>
.fi

.SH DESCRIPTION
.sp
.LP
The <\fBregex.h\fR> header defines the structures and symbolic constants used
by the \fBregcomp()\fR, \fBregexec()\fR, \fBregerror()\fR, and \fBregfree()\fR
functions. See \fBregcomp\fR(3C).
.sp
.LP
The structure type \fBregex_t\fR contains the following member:
.sp
.in +2
.nf
size_t re_nsub     number of parenthesized subexpressions
.fi
.in -2

.sp
.LP
The type \fBsize_t\fR is defined as described in <\fBsys/types.h\fR>. See
\fBtypes.h\fR(3HEAD).
.sp
.LP
The type \fBregoff_t\fR is defined as a signed integer type that can hold the
largest value that can be stored in either a type \fBoff_t\fR or type
\fBssize_t\fR. The structure type \fBregmatch_t\fR contains the following
members:
.sp
.in +2
.nf
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
.fi
.in -2

.sp
.LP
Values for the \fIcflags\fR parameter to the \fBregcomp\fR function are as
follows:
.sp
.ne 2
.na
\fB\fBREG_EXTENDED\fR\fR
.ad
.RS 16n
use extended regular expressions
.RE

.sp
.ne 2
.na
\fB\fBREG_ICASE\fR\fR
.ad
.RS 16n
ignore case in match
.RE

.sp
.ne 2
.na
\fB\fBREG_NOSUB\fR\fR
.ad
.RS 16n
report only success or fail in \fBregexec()\fR
.RE

.sp
.ne 2
.na
\fB\fBREG_NEWLINE\fR\fR
.ad
.RS 16n
change the handling of \fBNEWLINE\fR character
.RE

.sp
.LP
Values for the \fIeflags\fR parameter to the \fBregexec()\fR function are as
follows:
.sp
.ne 2
.na
\fB\fBREG_NOTBOL\fR\fR
.ad
.RS 14n
The circumflex character (^), when taken as a special character, does not match
the beginning of string.
.RE

.sp
.ne 2
.na
\fB\fBREG_NOTEOL\fR\fR
.ad
.RS 14n
The dollar sign ($), when taken as a special character, does not match the end
of string.
.RE

.sp
.LP
The following constants are defined as error return values:
.sp
.ne 2
.na
\fB\fBREG_NOMATCH\fR\fR
.ad
.RS 16n
\fBregexec()\fR failed to match.
.RE

.sp
.ne 2
.na
\fB\fBREG_BADPAT\fR\fR
.ad
.RS 16n
Invalid regular expression.
.RE

.sp
.ne 2
.na
\fB\fBREG_ECOLLATE\fR\fR
.ad
.RS 16n
Invalid collating element referenced.
.RE

.sp
.ne 2
.na
\fB\fBREG_ECTYPE\fR\fR
.ad
.RS 16n
Invalid character class type referenced.
.RE

.sp
.ne 2
.na
\fB\fBREG_EESCAPE\fR\fR
.ad
.RS 16n
Trailing '\e' in pattern.
.RE

.sp
.ne 2
.na
\fB\fBREG_ESUBREG\fR\fR
.ad
.RS 16n
Number in \fIdigit\fR invalid or in error.
.RE

.sp
.ne 2
.na
\fB\fBREG_EBRACK\fR\fR
.ad
.RS 16n
"[]" imbalance.
.RE

.sp
.ne 2
.na
\fB\fBREG_EPAREN\fR\fR
.ad
.RS 16n
"\e(\e)" or "()" imbalance.
.RE

.sp
.ne 2
.na
\fB\fBREG_EBRACE\fR\fR
.ad
.RS 16n
"\{\}" imbalance.
.RE

.sp
.ne 2
.na
\fB\fBREG_BADBR\fR\fR
.ad
.RS 16n
Content of "\{\}" invalid: not a  number, number too large, more than two
numbers, first larger than second.
.RE

.sp
.ne 2
.na
\fB\fBREG_ERANGE\fR\fR
.ad
.RS 16n
Invalid endpoint in range expression.
.RE

.sp
.ne 2
.na
\fB\fBREG_ESPACE\fR\fR
.ad
.RS 16n
Out of memory.
.RE

.sp
.ne 2
.na
\fB\fBREG_BADRPT\fR\fR
.ad
.RS 16n
\&'?', '*', or '+' not preceded by valid regular expression.
.RE

.sp
.ne 2
.na
\fB\fBREG_ENOSYS\fR\fR
.ad
.RS 16n
Reserved.
.RE

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Standard
.TE

.SH SEE ALSO
.sp
.LP
.BR regcomp (3C),
.BR types.h (3HEAD),
.BR attributes (7),
.BR standards (7)