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

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
Hey Monks. I found an anomaly, at least I think it is. Consider the following code:
#!/usr/bin/perl use strict; use warnings; my $str = '/path/to/f(il)e'; (my $name = $str) =~ s{.*/}{}; # basename (my $path = $str) =~ s{$name}{}; print " str = $str\n"; print "name = $name\n"; print "(unescaped) path = $path\n"; ($path = $str) =~ s{\Q$name\E}{}; print "(escaped) path = $path\n";

That produces the following output:

str = /path/to/f(il)e name = f(il)e (unescaped) path = /path/to/f(il)e (escaped) path = /path/to/

The first substitute (basename) worked. The 2nd, the one that was supposed to isolate the path part of the string does NOT work because there are parentheses in $name.

I worked around it with the \Q...\E trick, but I want to know why parens in the variable screwed up one substitute but not the other one

In reply to Parens mess up regex substitute by BenHopkins

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

  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?

    What's my password?
    Create A New User
    and all is quiet...

    How do I use this? | Other CB clients
    Other Users?
    Others meditating upon the Monastery: (4)
    As of 2018-02-26 04:01 GMT
    Find Nodes?
      Voting Booth?
      When it is dark outside I am happiest to see ...

      Results (316 votes). Check out past polls.