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sed - using regex and | need help

 
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Old 12-25-2008
Question sed - using regex and | need help
From my understanding when using regex1|regex2 the matching process tries each alternative in turn, from left to right, and the first one that succeeds is used.
When im trying to extract the name from those examples:

A) name.can.be.different.20.03.2009.boom
B) name.can.be.different.20.03.09.boom
C) name_can_be_different_2009_boom

by using:

Code:
sed 's/\(.*\)[._]\([0-9][0-9].[0-9][0-9].[0-9][0-9][0-9][0-9]\|[0-9][0-9].[0-9][0-9].[0-9][0-9]\|[0-9][0-9][0-9][0-9]\)[._]\(.*\)/\1/'

It gives:

A) name.can.be.different.20.03 (WRONG)
B) name.can.be.different (GOOD)
C) name_can_be_different (GOOD)

Why does it fail on A) ? By my order of regex pattern it's suppose to match on
[0-9][0-9].[0-9][0-9].[0-9][0-9][0-9][0-9] but it doesn't ?
 
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LEARN ABOUT DEBIAN

re_exec

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 3.44 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)