You try this, 
use warnings;
open FILE, "Testus.txt" or die "Couldn't open file.";
while (<FILE>) { print "$_ \n" if(/^(\d+\.\d+\t(\d+)\.\d+)/ and grep {
+$2} (41 .. 249)};

[download]
First match will check for digit,followed by period,then digit,then tab and finally digit in a line and second grep will check the third digit in the match is greater than 40 and less than 250.

In reply to Re: How to modify \d in RegEx by nvivek
in thread How to modify \d in RegEx by Erosia

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