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Re: modifying a file with regex!

by Marshall (Abbot)
on Mar 16, 2012 at 22:19 UTC ( #960080=note: print w/replies, xml ) Need Help??

in reply to modifying a file with regex!

There is no need to substitute anything. Capture what is necessary and re-format the ">" line.
No need to be overly tricky when a couple of straight-forward lines of code will do.
#!/usr/bin/perl -w use strict; my $ID = 1; while (<DATA>) { # this regex captures the trailing number if # the line starts with a ">" # the .*? means a "minimal match" of anything while # allowing the rest of the regex to succeed. # the \n is counted as white space, a \s* character # if (my ($number) = $_ =~ /^>.*?(\d+)\s*$/) { print '>ID'.$ID++," $number\n"; } else { print; } } =prints >ID1 80 AGGGGGGGGGTTCCC >ID2 85 TTTCCCGGGAAAA >ID3 112 GGCCCCTTTGAGG =cut __DATA__ >Sample_1_x80 AGGGGGGGGGTTCCC >Sample_2_x85 TTTCCCGGGAAAA >sample_3_x112 GGCCCCTTTGAGG
Well, if you want to get the sample number from the ">" line then:
while (<DATA>) { if (my ($sample, $number) = $_ =~ /^>.*?(\d+).*?(\d+)\s*$/) { print '>ID'.$sample," $number\n"; } else { print; } }
which will print the same thing

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Re^2: modifying a file with regex!
by rna_follower (Initiate) on Mar 17, 2012 at 00:15 UTC
    Thanks everyone for your useful comments/codes!

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[Corion]: So Hyperboria is an envrypted, decentralized IPv6 mesh network. I'm interested and want to look how good coverage is in my area. But the API for querying Hyperboria is only reachable over Hyperboria itself. Thanks but no thanks.

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