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finding two identical letters in a row

abcd1234
New User

Mar 3, 2010, 1:33 PM

Post #1 of 4 (8366 views)

finding two identical letters in a row	Can't Post

Hi,

I need a regular expression to help me find two identical letters in a row from a text or a list of words, etc.

if anyone can give me more than one option and please explain why you are using what! (if possible)

thanks

shawnhcorey
Enthusiast

Mar 3, 2010, 2:11 PM

Post #2 of 4 (8358 views)

Re: [abcd1234] finding two identical letters in a row [In reply to]	Can't Post

Try:

Code

#!/usr/bin/perl 
 
use strict; 
use warnings; 
 
for ( @ARGV ){ 
  @_ = /(([[:alpha:]])\2)/g; 
  while( @_ ){ 
    print shift(@_),"\n"; shift @_; 
  } 
}

__END__

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abcd1234
New User

Mar 3, 2010, 2:15 PM

Post #3 of 4 (8357 views)

Re: [shawnhcorey] finding two identical letters in a row [In reply to]	Can't Post

Okay... I just started using perl so I really don't know what that means. is there anything simpler.. just a one lined expression?

rovf
Veteran

Mar 5, 2010, 5:05 AM

Post #4 of 4 (8342 views)

Re: [abcd1234] finding two identical letters in a row [In reply to]	Can't Post

In Reply To

is there anything simpler.. just a one lined expression?

Aside from the fact that you can write *every* Perl expression in one line, the regexp in the example posted *was* written in one line.

Honestly, I think this solution is already pretty compact. I understand that regexpes are hard for programming novices, so instead of asking for something simpler, you should study the example and then ask a concrete question, if you don't understand something.

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