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Top Forums Shell Programming and Scripting Need perl regular expression to remove the comment Post 302453441 by karthigayan on Wednesday 15th of September 2010 08:58:17 AM
Old 09-15-2010
Error Need perl regular expression to remove the comment

I need a perl substitution to remove only the comment in the line . That line may have '#' with in double quotes .I used the following ,

Code:
 s/(^.*\".+?#.+?\".+?)(#.*)/$1/g

It works for ,

Code:
print " not a comment # not a comment " . "not a comment # not a comment" ;  # It is a comment

but for the line like ,

Code:
print " not a comment # not a comment " . "not a comment # not a comment" ;

It gave the output ,

Code:
print " not a comment # not a comment " . "not a comment

It removes the text from the last '#' . Can any one give me the exact regular expression to solve this problem .

Thanks in advance .
 

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GIT-STRIPSPACE(1)						    Git Manual							 GIT-STRIPSPACE(1)

NAME
git-stripspace - Remove unnecessary whitespace SYNOPSIS
git stripspace [-s | --strip-comments] < input DESCRIPTION
Clean the input in the manner used by Git for text such as commit messages, notes, tags and branch descriptions. With no arguments, this will: o remove trailing whitespace from all lines o collapse multiple consecutive empty lines into one empty line o remove empty lines from the beginning and end of the input o add a missing to the last line if necessary. In the case where the input consists entirely of whitespace characters, no output will be produced. NOTE: This is intended for cleaning metadata, prefer the --whitespace=fix mode of git-apply(1) for correcting whitespace of patches or files in the repository. OPTIONS
-s, --strip-comments Skip and remove all lines starting with comment character (default #). -c, --comment-lines Prepend comment character and blank to each line. Lines will automatically be terminated with a newline. On empty lines, only the comment character will be prepended. EXAMPLES
Given the following noisy input with $ indicating the end of a line: |A brief introduction $ | $ |$ |A new paragraph$ |# with a commented-out line $ |explaining lots of stuff.$ |$ |# An old paragraph, also commented-out. $ | $ |The end.$ | $ Use git stripspace with no arguments to obtain: |A brief introduction$ |$ |A new paragraph$ |# with a commented-out line$ |explaining lots of stuff.$ |$ |# An old paragraph, also commented-out.$ |$ |The end.$ Use git stripspace --strip-comments to obtain: |A brief introduction$ |$ |A new paragraph$ |explaining lots of stuff.$ |$ |The end.$ GIT
Part of the git(1) suite Git 1.8.5.3 01/14/2014 GIT-STRIPSPACE(1)
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