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What does this PERL expression mean?
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05-09-2008
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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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