Cleaning A Perl File With REGEXP

Following are the regular expressions which can be used to clean your file of unwanted material

1) Replace all the spaces with nothing.

s/\s//g;

2) Skip the lines with comments.

next if (m/^\#/);

3) skip blank lines

next if (m/^$/);

4) Replace a line in the file which has commented data on a code line.

s/\#.*$//;

5) Replace a line in the file which has data after semicolon

s/\;.*$//;

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Regular Expressions : email id

Almost everyone of us have sometime or other tried to write a regular expression for email ids and other stuff. \b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\b

Here is a link to regular expression site which reports various aspects of regular expressions related to perl, shell and many others. It has a classic example of regex for email id.

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