Re: User configurable regex

Can you give an example? I can't really see what the problem would be. ie, this works:

my $re = <STDIN>;
chomp ($re);
my $line = <STDIN>;
chomp ($line);
print "$line =~ /$re/\n";
if ( $line =~ /$re/ ) {
  print "match";
}
else {
  print "no match";
}
[download]

with input

a\d3
a23
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gives

a23 =~ /a\d3/
match
[download]

"What should it profit a man, if he should win a flame war, yet lose his cool?"

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Re^2: User configurable regex by MiggyMan (Sexton) on Oct 20, 2004 at 11:32 UTC
Well for a start im looking at substitutions not matches. Now if I pass the substitution from a variable I have to go and escape a whole bunch of thing OR make the user do it when they set the regex (which doesnt make me happy at all). for example `---------------------- #!/usr/bin/perl $user=".admin.ecc"; $uregex="~s/^\\.(\.)?\\.\./\$1/"; #$user =~ s/^\.(.)?\../$1/; $regstring="\$user=$uregex"; print "$regstring\n"; eval($regstring); print "User: $user\n"; ----------------------` [download] The regex to process my username is s/^\.(.)?\../$1/ but in order to get it working with eval it needs to be changed to this s/^\\.(\.)?\\.\./\$1/ which is not the most usefull thing in the world so what im looking for is some means to parse a regex string, if it comes down to it i'll use a whole bunch of regex for it but id rather not if i can help it.	[reply] [d/l]
Re^3: User configurable regex by Joost (Canon) on Oct 20, 2004 at 11:40 UTC
Why would your users have to type the double quotes? `#!/usr/bin/perl -w use strict; my $substitution = '$line =~ '.<DATA>; my $line = "abcdef"; eval $substitution; print $line; __DATA__ s/abc(\w+)f/xxx$1x/;` [download] output: `xxxdex` [download] Update: what I mean is; the problem you're describing only occurs in string literals (and it could already be a lot less annoying if you used single quotes). this interpolation does not occur in strings per se. "What should it profit a man, if he should win a flame war, yet lose his cool?"	[reply] [d/l] [select]
Re^4: User configurable regex by MiggyMan (Sexton) on Oct 20, 2004 at 12:03 UTC
You know i did try this earlier and im sure i did it right but to no avail however i've just done so again and it's working :) I'll go hide in the corner :) Just so you know the user would never type the regex out as such. they'll ultimatley be entering it via a gui interface and sending it off to a server to store in a config file, the regex is used in a print system i've been developing to re-format the usernames into more readable forms and it's used by the input filter :)	[reply]