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regexp in grep and diff ignore \t for tab, why?


From: lynx . abraxas
Subject: regexp in grep and diff ignore \t for tab, why?
Date: Sat, 12 May 2007 22:30:08 +0200
User-agent: Mutt/1.5.11

Hello!


Although  many  referneces  in the net quote grep to know  for tab matching it
seems it doesn't. Nor does it match a tab  with  [:blank:]  or  [:space:].  Is
there  a  reason for that? All other programmes using regexp understand . This
matter should be mentioned in the man page if not introduced to newer grep.
As diff -I uses grep regexp same applies for it! It took me  hours  to  figure
this out!

Regards,
Lynx








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