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Re^7: Regex Help

by AnomalousMonk (Canon)
on Mar 25, 2013 at 19:00 UTC ( #1025366=note: print w/replies, xml ) Need Help??

in reply to Re^6: Regex Help
in thread Regex Help

He mentioned in his OP the following separators: .-:. That being the case, the character class would be [.:-].

davido is absolutely right, but as you are apparently a regex tyro, it is prudent to mention a major pitfall lurking here.

The  '-' character is special in a character class: it denotes a range of characters. Taken in its originally stated order,  [.-:] would match all characters in the range from '.' to ':' inclusive, which includes all decimal digits and '/' (assuming the ASCII character set). To unmajick the '-' in a character class, put it as the first or last character, or escape it:
    [-.:]  [.:-]  [.\-:]
See perlre, perlrequick (esp. Using character classes), and perlrecharclass (esp. Bracketed Character Classes, Special Characters Inside a Bracketed Character Class, Character Ranges and Negation).

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