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Top Forums Shell Programming and Scripting Bash case Statement and Using Line Anchors? Post 302682731 by neutronscott on Monday 6th of August 2012 07:44:36 PM
Old 08-06-2012
bash can work with regex too, though it's generally better to use case for portability.
Code:
#!/bin/bash
re_start='^command'
re_alias='^command\[[[:alnum:]][^]]*\]'
re_equals='^command\[[[:alnum:]][^]]*\]='
re_path='^command\[[[:alnum:]][^]]*\]=/[[:alnum:]]*/.*'


test=$1
if [[ $test =~ $re_path ]]; then
        echo "matches path regex [[${BASH_REMATCH[0]}]]"
elif [[ $test =~ $re_equals ]]; then
        echo "matches equals regex [[${BASH_REMATCH[0]}]"
elif [[ $test =~ $re_alias ]]; then
        echo "matches alias regex [[${BASH_REMATCH[0]}]"
elif [[ $test =~ $re_start ]]; then
        echo "matches start [[${BASH_REMATCH[0]}]"
else
        echo "bugger if i know"
fi

Code:
$ for str in 'command[new]=/path/to/stuff' 'command[abc123]=str' 'command[broke]noequals' 'command!=foobar'; do ./re "$str"; done
matches path regex [[command[new]=/path/to/stuff]]
matches equals regex [[command[abc123]=]
matches alias regex [[command[broke]]
matches start [[command]

This User Gave Thanks to neutronscott For This Post:
 

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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 3.27 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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