Beefy Boxes and Bandwidth Generously Provided by pair Networks
Just another Perl shrine

Re: Regex Question

by kcott (Chancellor)
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

Replies are listed 'Best First'.
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

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1005584]
[karlgoethebier]: which means that it needs 331 bytes for "Lorem ipsum kizuaheli"?

How do I use this? | Other CB clients
Other Users?
Others taking refuge in the Monastery: (5)
As of 2017-11-23 14:29 GMT
Find Nodes?
    Voting Booth?
    In order to be able to say "I know Perl", you must have:

    Results (336 votes). Check out past polls.