> Five identical characters would be: /\[a-z,A-Z]\{4}/ I believe...
This would be any 4 characters in your set [a-z,A-Z] (including
the comma), it would match any of the following:
aaaa
,,,,
ZZZZ
A,b,
,A,Z
> Numbers would be: /\d\d\{2}\d/
This also would match things like
1221
1222
1223
2114
1234
For both cases, you need to tag something (or multiple
somethings) with the "\(...\)" syntax and then reference back to
it with "\1" to get the exact same character:
\([a-zA-Z]\)\1\{4}
\(\d\)\(\d\)\2\1
Otherwise, the repetition (the "\{...}") allows any match of the
previous pattern-atom rather than the resulting matched-atom.
Thus, your first pattern would be equivalent to
[a-z,A-Z][a-z,A-Z][a-z,A-Z][a-z,A-Z]
Hope this helps clarify things...
-tim
