Beefy Boxes and Bandwidth Generously Provided by pair Networks
Just another Perl shrine
 
PerlMonks  

Re: transliterate a sub-string

by johngg (Abbot)
on Jan 15, 2013 at 23:07 UTC ( #1013469=note: print w/ replies, xml ) Need Help??


in reply to transliterate a sub-string

As you don't show how you have combined the two it is difficult to judge. This seems fairly straightforward and not too clumsy. I'm not sure how that might be condensed further.

$ perl -E ' > $str = q{ABCDEFGHIJK}; > substr( $str, 3, 3 ) =~ tr{A-Z}{a-z}; > say $str;' ABCdefGHIJK

I hope this is helpful.

Cheers,

JohnGG


Comment on Re: transliterate a sub-string
Download Code
Re^2: transliterate a sub-string
by grondilu (Pilgrim) on Jan 16, 2013 at 07:18 UTC

    This is neat, but was certainly not obvious. Maybe it is worth reminding that indeed substr can be used as a lvalue, as explicitely said in its perldoc:

    You can use the substr() function as an lvalue, in which case EXPR must itself be an lvalue. If you assign something shorter than LENGTH, the string will shrink, and if you assign something longer than LENGTH, the string will grow to accommodate it. To keep the string the same length, you may need to pad or chop your value using "sprintf".

      as explicitely said in its perldoc:

      Said and shown :)

      my $name = 'fred'; substr($name, 4) = 'dy'; # $name is now 'freddy' my $null = substr $name, 6, 2; # returns "" (no warning) my $oops = substr $name, 7; # returns undef, with warning substr($name, 7) = 'gap'; # raises an exception

      Note that the lvalue returned by the three-argument version of substr() acts as a 'magic bullet'; each time it is assigned to, it remembers which part of the original string is being modified; for example:

      $x = '1234'; for (substr($x,1,2)) { $_ = 'a'; print $x,"\n"; # prints 1a4 $_ = 'xyz'; print $x,"\n"; # prints 1xyz4 $x = '56789'; $_ = 'pq'; print $x,"\n"; # prints 5pq9 }

      Wow, I can copy/paste :)

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1013469]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others drinking their drinks and smoking their pipes about the Monastery: (14)
As of 2014-12-18 10:13 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    Is guessing a good strategy for surviving in the IT business?





    Results (48 votes), past polls