Beefy Boxes and Bandwidth Generously Provided by pair Networks
more useful options
 
PerlMonks  

Re^2: tr///c doesn't seem to work as I expect

by romandas (Pilgrim)
on Sep 04, 2009 at 20:38 UTC ( #793590=note: print w/ replies, xml ) Need Help??


in reply to Re: tr///c doesn't seem to work as I expect
in thread tr///c doesn't seem to work as I expect

Wow.. maybe. Is that a valid range? I thought it meant '-' itself. That must be it.


Comment on Re^2: tr///c doesn't seem to work as I expect
Re^3: tr///c doesn't seem to work as I expect
by james2vegas (Chaplain) on Sep 04, 2009 at 20:42 UTC
    From perlop:
    The character "-" is treated specially and therefore "\-" is treated +as a literal "-".


    The - indicates a range.

    if($data !~ /^[\ \-\~\007\012\015\035\036\037]*$/) { $data =~ tr/[\ \-\~\007\012\015\035\036\037]/ /cs; }
    is probably what you need.
      Thanks. Given the rest of the code (not shown), actually the range makes a lot more sense. It might not be 'correct', but I at least understand what's going on now. :)

      One small point:

      In the  tr operator, the  [ and  ] characters have no special meaning. (In a 'normal' regex, they define a character set.) In the expressison (as taken from the OP)
          $data =~ tr/[\ -\~\007\012\015\035\036\037]/ /cs;
      the  [ and  ] characters simply represent themselves. This has no effect in this particular case, however, since these characters are also included in the range  \ -\~ that includes, IIRC, all printable ASCII characters. (I think a space qualifies as a 'printable' character.)

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://793590]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others having an uproarious good time at the Monastery: (7)
As of 2014-09-22 10:24 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

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











    Results (188 votes), past polls