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Re: Regex Question

by kcott (Canon)
on Nov 26, 2012 at 08:12 UTC ( #1005584=note: print w/ replies, xml ) Need Help??

in reply to Regex Question

G'day shealyw2,

index is another option:

Update: Oops! Left off the POSITION (index STR,SUBSTR,POSITION). Thanks, Ratazong. Here's an improved version.

$ perl -Mstrict -Mwarnings -E ' my $x = "abc"; say $x if index($x, "a", 2) == 2; my $y = "cba"; say $y if index($y, "a", 2) == 2; my $z = "aba"; say $z if index($z, "a", 2) == 2; ' cba aba
$ perl -Mstrict -Mwarnings -E ' my $x = "abc"; say $x if index($x, "a") == 2; my $y = "cba"; say $y if index($y, "a") == 2; ' cba

Note: index is based at zero (1st char = 0; 3rd char = 2)

-- Ken

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Re^2: Regex Question
by Ratazong (Monsignor) on Nov 26, 2012 at 08:30 UTC
    Your index won't work in case there is an a before the third position, e.g. in the string aba. If you (really) want to use index, use the 3-argument-form instead:
    $x = "aba"; print "$x\n" if index($x, "a", 2) == 2;
    HTH, Rata

      ++ Thanks Ratazong. You're absolutely correct. I've updated my node.

      -- Ken

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