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Re: Regex question

by tangent (Vicar)
on Jun 24, 2016 at 00:07 UTC ( #1166454=note: print w/replies, xml ) Need Help??

in reply to Regex question

When you have an escape character ('\') in your string the way you assign it to a variable will affect the result. If you assign using double quotes then you need to escape the escape character in your string, just like you do in the regular expression, and this is what the error is telling you. If you use single quotes it will work without escaping:
my $string; print "Double quotes\n"; $string = "LoadStore.SGE.\sr1_addr_reg_tmp_reg[0]"; match(); print "Double quotes with escape\n"; $string = "LoadStore.SGE.\\sr1_addr_reg_tmp_reg[0]"; match(); print "Single quotes\n"; $string = 'LoadStore.SGE.\sr1_addr_reg_tmp_reg[0]'; match(); sub match { if ( $string =~ m/LoadStore\.SGE\.\\.r._addr_reg_tmp_reg/ ) { print "match\n"; } else { print "no match\n"; } }
Double quotes no match Error: Unrecognized escape \s passed through Double quotes with escape match Single quotes match

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