diff and ignore regex

[Nadim Shaikli]

I'm curious if it's possible to add an option to 'diff' so that certain
regular expression strings (and characters) can be ignored.  So something
akin to,

 $ diff --ignore_regex "one | two | three" file1.txt file2.txt

So whenever "one" or "two" or "three" is seen it would be ignored (think
of it as a more general extension of the '--ignore-space-change' option)
or maybe allow perl to grok the text to determine the regex or...  This
would come in _very_ handy for more complex languages where diacritics
are used which in some instances ought not trigger a 'difference' and so
it seems logical to give the user the option to ignore certain characters
and combinations there-of.  This would also be nice for cases where you
know two documents differ in certain strings/characters yet you want to
see if there are any other changes.

Thoughts/comments ?

Regards,

 - Nadim


                
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