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Re: Regular expression for a comma separated string

by Loops (Curate)
on Nov 23, 2014 at 23:43 UTC ( [id://1108196]=note: print w/replies, xml ) Need Help??


in reply to Regular expression for a comma separated string

Hi,

Hopefully this does the trick for you, using negative lookahead to make sure each character doesn't repeat before the comma (or end of string):

my @tst = qw(   A,G AG,CT TC,CA GAT,CGA CGAT,TG ,G
                ACGT X,A AA,G AC,GGC ATGA,TGG ATCXG,AAC
);

for (@tst) {
        my $side = qr/(?:([ACGT])(?![^,]*\g{-1}))+/;
        print $_ . (/^$side,$side$/ ? ' good' : ' bad') . $/;
}

[download]
Prints: 
A,G good
AG,CT good
TC,CA good
GAT,CGA good
CGAT,TG good
,G bad
ACGT bad
X,A bad
AA,G bad
AC,GGC bad
ATGA,TGG bad
ATCXG,AAC bad

[download]

Oops, more test coverage showed an issue. Needed to use relative group instead of "\1" as originally posted which had a problem with "AC,AC". Fixed.

Replies are listed 'Best First'.
Re^2: Regular expression for a comma separated string
by naderra (Novice) on Nov 25, 2014 at 14:25 UTC

    Loops, thank you kindly for your solution.

    For testing, the following code generated all, up to 4 in length, possible permutations with repetition of ACGT; the inclusion of incorrect characters can be added later by hand.

    Read more... Generate test data (1178 Bytes)

    test program:

    Read more... Test program (682 Bytes)

    and then: 

    $ ./generate_ACGT_01.pl > y
$ cat y | ./test_ACGT_01.pl > x
$ less x

    [download]

    Robert

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