Martin McCarthy <marty(_at_)ancient-scotland(_dot_)co(_dot_)uk> writes:
A space and a tab in square brackets means match either a space or a
tab. In other words it matches whitespace. Most times just a space is
fine, but a mail client may validly use tabs instead.
There is the source of my confusion. When I looked at that
formulation in another post here. Checking with cursor and space bar
it showed 5 spcs no tab. My regexp used 5 spc no tab. I expected
[ \t] I guess.
Now I see that 5 spcs would also work (even if only by accident), long
as no tabs were encountered. Finally the last penny fell.
Thanks for being patient.
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