Beefy Boxes and Bandwidth Generously Provided by pair Networks
P is for Practical
 
PerlMonks  

comment on

( [id://3333]=superdoc: print w/replies, xml ) Need Help??
The easiest way is not to limit the number of regex matches, but to trim the results with a list slice.
Let match global do its thing and then return the first 3 matches.
#!/usr/bin/perl -w use strict; my $str='dog dog horse dog cow dog pig dog'; my @dogs = ($str =~ m/dog/g)[0..2]; print "number of dogs = ".@dogs,"\n"; # the . concatenation puts @dogs in a scalar context # same as print scalar(@dogs) print "@dogs\n"; ################## # so what happens if there aren't 3 dogs? # one way is to use map to filter the undef's out # To return a "nothing at all" from map, use () # undef is a value and that won't work... # # This returns a maximum of 3 dogs if there are that # many or more dogs, otherwise it returns less. # my $second_pack = "dog horse cow"; @dogs = map{$_ or ()}($second_pack =~ /dog/g)[0..2]; print "\nsecond pack = ".@dogs, " dogs\n"; print "@dogs"; __END__ number of dogs = 3 dog dog dog second pack = 1 dogs dog

In reply to Re: Limiting number of regex matches by Marshall
in thread Limiting number of regex matches by eversuhoshin

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.
Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Chatterbox?
and the web crawler heard nothing...

How do I use this?Last hourOther CB clients
Other Users?
Others musing on the Monastery: (5)
As of 2024-03-19 11:32 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found