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By: keithmarshall
$ info diff "diff options"
gSpecified Lines
(this is the "Specified "Lines note, linked from the "diff Options" menu item
in the diff info-pages) says:
To ignore insertions and deletions of lines that match a
`grep'-style regular expression, use the `-I REGEXP' or
`--ignore-matching-lines=REGEXP' option.
grep-style implies the class explicitly defined as "basic regular expressions";
your "(w|x)" is an example of the class defined as "extended regular
expressions",
and hence would not fit this documented usage requirement of diff.
In BRE parlance, *none* of the characters "(", "|" or ")" are considered
special,
so "(w|x)" is just an expression which matches itself, in its entirety, i.e.
the complete literal sequence "(w|x)". If you want an expression to match
either
of the *single* characters "w" or "x", it is "[wx]". If, (as seems more
likely),
"w" and "x" represent longer strings, then you can invoke your diff command as
$ diff -I w -I x file1file2
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