This is the kind of thing that works really well when written as a filter (i.e. a program that reads data from STDIN and writes it to STDOUT).
#!/usr/bin/perl
use strict;
use warnings;
while (<STDIN>) {
s/font-size:\s*14pt/font-size: 18pt/ig;
print;
}
But you can also write it on the command line:
$ perl -i.bak -pe 's/font-size:\s*14pt/font-size: 18pt/ig;' yourfile.h
+tml
--
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