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:
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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.)
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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 |