How to combine regexps?

kj at
Wed Aug 5 22:09:25 CEST 2009

One of the nice things one can do with Perl's regexp's is illustrated
in the following example:

my $gly = qr/gg[ucag]/i
my $ala = qr/gc[ucag]/i;
my $val = qr/gu[ucag]/i;
my $leu = qr/uu[ag]|cu[ucag]/i;
my $ile = qr/au[uca]/i;

my $aliphatic = qr/$gly|$ala|$val|$leu|$ile/;

In other words, one can build regular expressions by re-combining
other regular expressions.

Is there a way to do this with Python's regexps?



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