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iTechForums » Programming Languages » Perl »

What does this PERL expression mean?

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Old 05-08-2008, 08:57 AM
Licursi Licursi is offline
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What does this PERL expression mean?
/^[-+]?\d+\.\d+$/

Can someone please break this down for me?

Thanks!
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Old 05-08-2008, 08:58 AM
Aamina Aamina is offline
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that's called a "regular expression"

you may want to do some research on regular expressions to figure out what they mean, but i'll break this down for you:

/^[-+]?\d+\.\d+$/
the first "/" and last "/" are only there to enclose the regular expression:

^[-+]?\d+\.\d+$
the "^" means to check from the beginning and "$" means to check all the way to the end.

[-+]?
the ? means to match 1 or 0 of any of the characters enclosed in the square brackets [ ]...

\d+
this means to match any digit character, represented by \d, and the "+" means to match any digit 1 or more times.

\.
this means to match a period

\d+
same as the other
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Old 05-08-2008, 08:58 AM
Mike S Mike S is offline
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everything stays as aamina said except english description: the expression will be true if checked variable represents decimal number (preceding + or - sign is optional)
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