07-16-2010
Quote:
Originally Posted by
mirage
'.' matches "one or more of previous characters"
"." (dot) specifies "any single character"
"+" (plus) specifies "one or more of previous"
---------- Post updated at 01:04 AM ---------- Previous update was at 12:59 AM ----------
Quote:
Originally Posted by
mirage
I should be reading it as:
"Match characters
^ - starting with
[0123456789] - one of the digits from 0 thro' 9 and
*$ - zero (none) or more of digits from 0 thro' 9 at the end. "
Thus it matches 3, 33, 34, 345 etc.
You should read as:
"Match characters
^ - starting with
[0123456789]* - zero or more digits from 0 thro' 9 and
$ - end."
---------- Post updated at 01:05 AM ---------- Previous update was at 01:04 AM ----------
Quote:
Originally Posted by
mirage
I should be reading it as:
"Match characters
^ - starting with
[0123456789] - one of the digits from 0 thro' 9 and
*$ - zero or more of digits from 0 thro' 9 at the end. "
Thus it matches 3, 33, 34, 345 etc.
You should read as:
"Match characters
^ - starting with
[0123456789]* - zero (none) or more digits from 0 thro' 9 and
$ - end."
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RE_COMP(3) Linux Programmer's Manual RE_COMP(3)
NAME
re_comp, re_exec - BSD regex functions
SYNOPSIS
#define _REGEX_RE_COMP
#include <sys/types.h>
#include <regex.h>
char *re_comp(char *regex);
int re_exec(char *string);
DESCRIPTION
re_comp() is used to compile the null-terminated regular expression pointed to by regex. The compiled pattern occupies a static area, the
pattern buffer, which is overwritten by subsequent use of re_comp(). If regex is NULL, no operation is performed and the pattern buffer's
contents are not altered.
re_exec() is used to assess whether the null-terminated string pointed to by string matches the previously compiled regex.
RETURN VALUE
re_comp() returns NULL on successful compilation of regex otherwise it returns a pointer to an appropriate error message.
re_exec() returns 1 for a successful match, zero for failure.
CONFORMING TO
4.3BSD.
NOTES
These functions are obsolete; the functions documented in regcomp(3) should be used instead.
SEE ALSO
regcomp(3), regex(7), GNU regex manual
COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
GNU
1995-07-14 RE_COMP(3)