Re: Question on REGEXP

| has a special meaning in a regex: it separates alternatives. If you know your variable should not contain any special characters, you can "quote" it by using \Q:

my $id_to_match = '1QJ8:A|PDBID|CHAIN';
while (<>) {
    if (/\Q$id_to_match/) {
        # ...
    }
}
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See Escape sequences in perlre for details.

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Re^2: Question on REGEXP by Anonymous Monk on Mar 10, 2014 at 14:11 UTC
So this escapes everything, right? I mean, if you want to treat any given character as normal character, without any exceptions/special meanings.	[reply]
Re^3: Question on REGEXP by choroba (Cardinal) on Mar 10, 2014 at 14:14 UTC
Yes. If you only want to escape some characters, you can try the hard way: adding `\` in front of them in the string. If you want to escape anything in a substring, you can end the effect of \Q by \E. `/\Q$literal_characters\E$special_characters/` [download] لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ	[reply] [d/l] [select]
Re^4: Question on REGEXP by poulhs (Beadle) on Mar 10, 2014 at 17:49 UTC
or use quotemeta - see perldoc -f quotemeta	[reply]
Re^4: Question on REGEXP by Anonymous Monk on Mar 10, 2014 at 14:51 UTC
Aha, thanks for the tips :)	[reply]