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Re: Re: Re: Re3: BioInformatics - polyA tail search

by fletcher_the_dog (Friar)
on Sep 02, 2003 at 19:59 UTC ( #288418=note: print w/replies, xml ) Need Help??

in reply to Re: Re: Re3: BioInformatics - polyA tail search
in thread BioInformatics - polyA tail search

I wrote a little test script to test if you were right (and you were), so my question is what use is the upper range indicator? I thought it allowed you to limit the number of times that something matched, but apparently it does not.
#!/usr/bin/perl use strict; my $seq = "ANANNNNANANANANANANANANANANA"; if ($seq=~/[AN]{10,11}?/) { print "I matched\n"; } else { print "I did not match!\n"; } __OUTPUT__ I matched

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Re: Re: Re: Re: Re3: BioInformatics - polyA tail search
by runrig (Abbot) on Sep 02, 2003 at 20:26 UTC
    A comma in the range is useful if you are matching something after the sequence, or if you are using capturing parenthesis to save the matched sequence. If you only want to match sequences of 10 and not longer, you would need a negative-lookahead (see perlre) after the {10}.

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