Re: help needed to solve in regex

You're using a string where a regular expression is expected.

my $find_re = qr/1\.2\.3/i;
...
grep /$find_re/, ...
...
[download]

my $find_str = '1.2.3';
my $find_re  = quotemeta($find_str);
...
grep /$find_re/i, ...
...
[download]

my $find_str = '1.2.3';
...
grep /\Q$find_str\E/i, ...
...
[download]

Comment on Re: help needed to solve in regex Select or Download Code

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Re^2: help needed to solve in regex by diotalevi (Canon) on Jan 10, 2007 at 05:59 UTC
You forgot the surround the pattern with \b markers. `/\b\Q$find\E\b/` ⠤⠤ ⠙⠊⠕⠞⠁⠇⠑⠧⠊	[reply] [d/l]
Re^3: help needed to solve in regex by ikegami (Patriarch) on Jan 10, 2007 at 06:26 UTC
oh, I didn't notice that matched the third line. Unforunately, I don't agree with your solution. That is to say I don't think we can provide a solution with the information he provided us. For example, all of the following match his criteria, yet all are different: `/\b\Q$find\E\b/` `/(?<!\S)\Q$find\E/(?!\S)` `/\Q$find\E/(?!\.)` `/\Q$find\E$/` `/\Q$find\E$/m` `/\Q$find\E\z/` ... The op should have a look at perlre. (Or should I say "another look" since he should already have looked there when he started having problems with his regexp...)	[reply] [d/l] [select]