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Extract numbers

by tye (Sage)
on Mar 01, 2001 at 04:23 UTC ( #61475=snippet: print w/replies, xml ) Need Help??
Description:

This is a cheap and optimistic way of extracting numbers from text. It is quite easy to think of cases where this won't work, but there are tons of real-life cases where it works nicely. I allow for numbers at the end of sentences, like 1.23e3. I certainly don't handle expressions like 1.2+3.4-5.6. This was chosen for simplicity of the regex.

Update: Now also handles cases like "123ears" after reading Identifying and parsing numbers.

my @numbers= $text =~ /([-+\d.eE]*\d)/g;

Previous version was:

my @numbers= grep { s/\.$//; /\d/ } $text =~ /([-+\d.eE]+)/g;

Update: petral's excellent advice incorporated.

Replies are listed 'Best First'.
Re: Extract numbers
by petral (Curate) on Mar 01, 2001 at 08:25 UTC
    A slight fuss: [-+\d.eE]is probably a little faster than /i. (Though the regex engine is so smart it may figure out there's only one letter and do this anyway.)

    p
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