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Re^4: Search and replace

by Athanasius (Abbot)
on Jan 31, 2013 at 16:23 UTC ( #1016350=note: print w/ replies, xml ) Need Help??


in reply to Re^3: Search and replace
in thread Search and replace

I thought I already had. :-) But OK, let’s add an /x modifier to the regex to make it easier to break apart:

$found =~ s/ ENV{\" # match the characters: ENV{" (.*?) # followed by any characters -- this sequence +is the "value", and the parentheses capture it into the special varia +ble $1 \"} # followed by: "} / \$ENV( # and substitute a literal: $ENV(" $1 # followed by the captured "value" \") # followed by: ") /gx; # and repeat the search & replacement to the e +nd of $found

Notes:

  • The double quotes are backslashed only because I was using a one-liner (and I’m on Windows). This is unnecessary in a .pl script. (But the $ must be backslashed to show that it is literal, not the special symbol for “match the end of a line” (in the search part) or a sigil denoting a scalar variable to be interpolated (in the replacement part). Update: Added the words from “(in the search part)” to the end of the sentence.)

  • The ? in the capture group (.*?) makes the match non-greedy. So the regex engine looks for the fewest number of characters occurring between ENV{" and "}. Without the ?, the match would be greedy, and on the string:

    ENV{"VCINSTALLDIR"}\ATLMFC\LIB\amd64;ENV{"LIBPATH"}

    it would match

    VCINSTALLDIR"}\ATLMFC\LIB\amd64;ENV{"LIBPATH
  • which is not what we want!

Hope that helps,

Athanasius <°(((><contra mundum Iustus alius egestas vitae, eros Piratica,


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Re^5: Search and replace
by Bharath666 (Novice) on Feb 01, 2013 at 05:57 UTC

    Yeah!! I got it now :) Thanks a lot :)

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