Here is a one-liner for this: 
 perl -p0777 -i.BAK -e 's/my \$t0 = \[gettimeofday\];.+?\.\s*\$1;\s+}/
+/s;' Your.module.names.here

[download]
This takes advantage of the -0 option to set the input record separator to 0x777 (which is not a valid character, and can not occur in your files), and the "s" option in the regex to span matching a '.' across multiple lines.

The explanation in this debian admin article is mostly applicable - except they use the regex option 'm' to handle a slightly different use-case.

If you wanted to match line boundaries, in addition to matching '.' across lines, the 's' and 'm' options can be used together.
Update: Minor Aesthetic change: -iBAK to -i.BAK

             I hope life isn't a big joke, because I don't get it.
                   -SNL

In reply to Re: How to delete mutiple line from many pm files at one time by NetWallah
in thread How to delete mutiple line from many pm files at one time by Priti24

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