About re.search() question

Dev Shed Forums Sponsor:

March 2nd, 2013, 03:23 PM

MynE

Contributing User

Join Date: Nov 2012

Posts: 38

Time spent in forums: 7 h 18 m 33 sec
Reputation Power: 1

About re.search() question

Hi, I have a question with the code below about re() module

phrase = 'Les't play my music now'

m = (re.search(("play"), phrase) and re.search(("music"), phrase))

k = m.group(0)
print k // I got only one word 'music'

I'd like to capture two words which are 'play' and 'music', can someone please tell me how can I do that?

by 'k' should have an out put like this 'play','music'. please help me find out. Thank you

March 2nd, 2013, 08:20 PM

b49P23TIvg

Contributing User

Join Date: Aug 2011

Posts: 3,458

Time spent in forums: 1 Month 2 Weeks 4 Days 6 h 26 m 43 sec
Reputation Power: 403

Would wider spacing help you see?

Code:

m = re.search("play",phrase)      and        re.search("music",phrase)

The result of a python expression involving `and' and `or' logical tests is the last object python needed to evaluate to resolve the condition. Python evaluates from left to right, and obeying parentheses.

Thus 131 is the result of

131 or 'Our cat Zippy'

Try it in the interpreter!

In your case

Code:

re.search("play",phrase) and re.search("music",phrase)

the search for 'play' succeeded so the match object tested True, so python evaluated
re.search("music",phrase)
Since there's nothing left to evaluate python returns the object that determined the outcome of the `and' expression and assigns it to m.

__________________
[code]Code tags[/code] are essential for python code!

Last edited by b49P23TIvg : March 2nd, 2013 at 08:22 PM.

March 2nd, 2013, 10:17 PM

MynE

Contributing User

Join Date: Nov 2012

Posts: 38

Time spent in forums: 7 h 18 m 33 sec
Reputation Power: 1

Oh I thank you, because of you I've got some ideas, here's what I have now:

Code:

phrase = "Lets play my music"

j = re.search(("play"), phrase)
m =  re.search(("music"), phrase)
if m and j:
       try:
          k = m.group(0)
          l = j.group(0)
          phrase = l+' '+k
          print phrase  // result is 'play music'
       except AttributeError:
          print "No match found"

I'd like to ask you that what if I want to search multiple strings at the same time, is it possible to do that? for example like:

j = re.search(("play" || "open"), phrase)
m = re.search(("music" || "song"), phrase)

Is it possible to do something like this in only one line? i'd appreciate your answer very much. Thank you so much.

March 2nd, 2013, 10:45 PM

b49P23TIvg

Contributing User

Join Date: Aug 2011

Posts: 3,458

Time spent in forums: 1 Month 2 Weeks 4 Days 6 h 26 m 43 sec
Reputation Power: 403

Mastering Regular Expressions by Friedl.
You could enjoy this book, or study this
Practice on the python command line.

About re.search() question

Developer Shed Advertisers and Affiliates