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Re: Reg Expression Question

by azatoth (Curate)
on Aug 31, 2001 at 12:00 UTC ( #109316=note: print w/replies, xml ) Need Help??

in reply to Reg Expression Question

Update : Semi-wrong answer given by me, azatoth the regex spastic. Off to read Owl book.

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Re: Re: Reg Expression Question
by blakem (Monsignor) on Aug 31, 2001 at 12:06 UTC
    $i =~ /[0|5|8|15|20]/

    But that will also match 30,15,888,150,200, etc...

    If you really want to use a regex for this, you'll need to anchor it like so:

    $i =~ /^(0|5|8|15|20)$/;
    Though I still think a hash is a better solution.

    Update: changed the square brackets to parens, thanks Hofmator...


Re: Re: Reg Expression Question
by Hofmator (Curate) on Aug 31, 2001 at 12:07 UTC

    Well, no ... $i =~ /[0|5|8|15|20]/;matches one character which is either 0, 1, 2, 5, 8 or |. And only if you correct the typo ;-)

    What you can do is use parenthesis like this $i =~ /^(0|5|8|15|20)$/; but make sure you have the start and end of string assertions, otherwise you will match much more numbers.

    Apart from that I think a hash would be a better solution as already mentioned elsewhere.

    -- Hofmator

Re: Re: Reg Expression Question
by Jonathan (Curate) on Aug 31, 2001 at 12:05 UTC
    That would also match 1 which is incorrect.
    $i = 1; print "found\n" if $i =~ /[0|5|8|15|20]/;
Re: Re: Reg Expression Question
by Kevman (Pilgrim) on Aug 31, 2001 at 12:02 UTC
    Sorry, Cut & pasted code.
    Original Code has square brackets and it doesnt work!!
    Will try the hash idea?
    Thanks All

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