Re: Bash-4.3-rc2 available for FTP

[Mike Frysinger]

On Thursday, January 30, 2014 10:48:34 Chet Ramey wrote:
> o. The shell now handles backslashes in regular expression arguments to the
>    [[ command's =~ operator slightly differently, resulting in more
>    consistent behavior.

hmm, i seem to be running into a bug here.  the bash man page suggests that 
the behavior should match regex(3), but it doesn't seem to.  consider:

        $ cat doit.sh 
        v="a\-b"
        [[ ! a-b =~ ${v} ]]
        : $?

        # This is expected behavior.
        $ bash-4.2_p45 -x ./doit.sh 
        + v='a\-b'
        + [[ ! a-b =~ a\-b ]]
        + : 1

        # This is unexpected behavior.
        $ bash-4.3_rc2 -x ./doit.sh 
        + v='a\-b'
        + [[ ! a-b =~ a\\-b ]]
        + : 0

compare that to regex(3) behavior:
$ cat test.c
#include <stdio.h>
#include <regex.h>
int main(int argc, char *argv[]) {
        regex_t preg;
        int i1 = regcomp(&preg, argv[1], 0);
        int i2 = regexec(&preg, argv[2], 0, NULL, 0);
        printf("regcomp(%s) = %i\n"
                "regexec(%s) = %i\n", argv[1], i1, argv[2], i2);
        return 0;
}

$ gcc test.c
$ ./a.out 'a\-b' a-b
regcomp(a\-b) = 0
regexec(a-b) = 0

it had no problem matching ...
-mike

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