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Problem matching multiple words

 
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martix



Joined: 20 Apr 2007
Posts: 17

PostPosted: Tue Apr 29, 2008 12:03 am    Post subject: Problem matching multiple words Reply with quote

How do I match multiple instances of a regex?
For example
Quote:
07 This_Weekends__Vacation 02.03.2008
03 My.Summer.Camp 210 pic
12 The Villa 12 pics
...

How do I make it match all of the words and replace all whitespaces with space " ".

Something like:
Code:
(([^a-zA-Z]*)([a-zA-Z]+))+?.*?

Which right now matches only the first word...
What should remain basically is just all the words, nothing else:
Quote:
This Weekends Vacation
My Summer Camp
The Villa
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admin
Site Admin


Joined: 09 Mar 2007
Posts: 446
Location: Canada

PostPosted: Thu May 01, 2008 7:07 am    Post subject: Reply with quote

In principle you can take a regex, surround it in parentheses, and then add a repeat specifier.

Your example could become:

((([^a-zA-Z]*)([a-zA-Z]+))+?.*?)+

or

((([^a-zA-Z]*)([a-zA-Z]+))+?.*?){1,3}


If that doesn't solve the problem then I need more information.
For instance what replace specifier are you using?

Maybe another approach is to eliminate the numbers and the word pic (or pics) as follows:
Either cut and paste the search/replace row content below (without the single quotes) or use the CTL-F2 trick to copy everything below (with the mouse), select the PFrank window (with the mouse), and press CTL-F2.

Row: 1
Search: '(?E)[_ .]*[0-9][_.]*'
Replace:
Row: 2
Search: '(?E)[_.]'
Replace: ' '
Row: 3
Search: '(?E)[ ]+pic[s]*([ ]|$)'
Replace: ' '
Row: 4
Search:
Replace: '*Delete All Extra Whitespace in*Prefix*'


Cheers.

Peter.
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martix



Joined: 20 Apr 2007
Posts: 17

PostPosted: Tue May 06, 2008 9:51 pm    Post subject: Reply with quote

Well...
Its an interesting problem, to see just how powerful the python engine really is. Thats kinda the main point. The items are not so much (22) so I could do them by hand in less than 5 mins. But I just wanted to see if it could tackle such a task using regex. Smile Had nothing better to do.
But
((([^a-zA-Z]*)([a-zA-Z]+))+?.*?)+
or
((([^a-zA-Z]*)([a-zA-Z]+))+?.*?){1,3}
Both give the last matched string only; {1,#} gives only the #-th word.
And I have no idea what (?E) should mean.

Leave the specific example out of it. The general problem here is matching multiple repetitions of a regex, not just its last possible occurrence like it happens now.
I guess its because there is a single group reference which stores only the last of the repetitions.
Encapsulating it in another set of ()'s and using the new group's reference doesn't change anything too.
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bitmonger



Joined: 03 Oct 2007
Posts: 3

PostPosted: Sat Jun 07, 2008 11:41 pm    Post subject: Reply with quote

Maybe I don't understand the problem correctly, but from the example given I think a better approach would be to search for and replace the non letter groups with a single space, rather than capturing the letters and putting spaces in between.

I put
(?x)[^a-zA-Z]+
as a search pattern
and a single space as a replace. This replaces all groups of non letters with a single space and the result is

This Weekends Vacation
My Summer Camp
The Villa


There will be a single space at the start of the name (if it started with non letters), but if that is a problem just do a second line search for
(?Ex)^\s+
and a replace with nothing

Cheers,
bit
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