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Full Discussion: extract key values
Top Forums Shell Programming and Scripting extract key values Post 302442981 by clx on Friday 6th of August 2010 06:12:02 AM
Old 08-06-2010
Code:
'/TEST [0-9][0-9]*/

searching for the pattern. TEST<space><one or more digits>

Code:
s/.*TEST \([0-9][0-9]*\).*/\1/p'

removing everything but the required numbers from the above matched lines.

\(..\) are used to save the regex/pattern found.
\1 are used to recall the above regex/pattern.

you can have max 9 such recalls.
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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 3.44 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)
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