Beefy Boxes and Bandwidth Generously Provided by pair Networks
go ahead... be a heretic
 
PerlMonks  

Re: Replace the nth occurence

by trizen (Friar)
on Nov 21, 2012 at 10:56 UTC ( #1004895=note: print w/ replies, xml ) Need Help??


in reply to Replace the nth occurence

A general solution:

my $nth = 4; my $str = 'a=>bb=>ccc=>dddd=>eeeee=>ffffff'; while ($str =~ /=>/g) { if (--$nth == 0) { substr($str, $-[0], $+[0] - $-[0], '~~|~~'); last; } } print "$str\n";


Comment on Re: Replace the nth occurence
Download Code
Re^2: Replace the nth occurence
by AnomalousMonk (Abbot) on Nov 21, 2012 at 22:49 UTC

    In the sprit of this, also a generalized approach. No benchmarking done for two regexes used or versus other approaches. Note also that the index of the occurrence of the pattern which will be replaced is now zero-based. (Also: This approach could be generalized yet further by passing either a plain replacement string or a code reference. The string/reference could then be fed as appropriate to one of two  s/// substitutions, one without a /e regex modifier, one with. Code of a replacement reference would have access to all capture variables, etc.) All tests pass.

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1004895]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others scrutinizing the Monastery: (4)
As of 2014-09-21 05:00 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    How do you remember the number of days in each month?











    Results (166 votes), past polls