Perl Guru Forums: Perl Programming Help: Beginner: Tokenizing

CGI/Perl Guide | Learning Center | Forums | Advertise | Login

Site Search: in


	MAIN INDEX	SEARCH POSTS	WHO'S ONLINE	LOG IN

Home: Perl Programming Help: Beginner:
Tokenizing

BeatF6
New User

Jul 13, 2013, 2:46 PM

Post #1 of 4 (1220 views)

Tokenizing	Can't Post

Hi @ all

With my script (which is big), I want to find the following sequence:

parenthesis + SOMETHING + parenthesis + comma

["(" + ... + ")" + ","]

If this is found, I'd like to insert a space after the second parenthesis such that this is splitted afterwards in my script. How can that be done? Thanks for any help and propositions.

I have an example, where all the names needed are present:

Code

if($line =~ m/^([^. \t]+\w\.)([A-Z][^ \240]*)/) # treats words that should be split 
	{ 
		$line =~ s/(?<=[^. \t]\w\.)(?=[A-Z])/ /g; 
	}

Laurent_R
Veteran / Moderator

Jul 14, 2013, 1:59 AM

Post #2 of 4 (1217 views)

Re: [BeatF6] Tokenizing [In reply to]	Can't Post

To really give a reliable answer we would need to know what the SOMETHING is.

This is quick test under the Perl debugger:

Code

  DB<1> $string = "the quick brown (fox), the (lazy), dog."; 
 
  DB<2>  $string =~ s/(\(.+?\)),/$1 ,/g; 
 
  DB<3> p $string 
the quick brown (fox) , the (lazy) , dog. 
  DB<4>

So it seems to be doing what you want. But it might not work if you have nested parens with commas in your SOMETHING.

BeatF6
New User

Jul 14, 2013, 2:07 AM

Post #3 of 4 (1214 views)

Re: [Laurent_R] Tokenizing [In reply to]	Can't Post

Ok, so the correct implementation would be:

Code

 
if($line =~ m/^([^. \t]+\w\.)([A-Z][^ \240]*)/) # treats words that should be split  
	{  
		$line =~ s/(\(.+?\)),/$1 ,/g;  
	}

(I'm a newbie, so...sorry for this stupid question, but I'd like to be sure ;) )

Laurent_R
Veteran / Moderator

Jul 14, 2013, 2:13 AM

Post #4 of 4 (1213 views)

Re: [BeatF6] Tokenizing [In reply to]	Can't Post

Assuming your m// regex is correct (which I cannot confirm, not knowing what it is supposed to do), yes.

Search for (options)

Web Applications & Managed Hosting Powered by Gossamer Threads
Visit our Mailing List Archives