ExpandRegexSet

EXPANDREGEXSET is a function written for CSSM as an
example and is not well thought out. It turns an expression like abc[def] into {'abcd', ...
'abce','abcf'}

This is similar to REGEXPIOR which can be found in my REGEXTOOLS (regular expression tools) at MATLAB Central.

USAGE
>> ExpandRegexSet('abc[def]ghi[jkl][mno]')'
ans =
Columns 1 through 6
'abcdghijm' 'abcdghijn' 'abcdghijo' 'abcdghikm' 'abcdghikn' 'abcdghiko'
Columns 7 through 12
'abcdghilm' 'abcdghiln' 'abcdghilo' 'abceghijm' 'abceghijn' 'abceghijo'
Columns 13 through 18
'abceghikm' 'abceghikn' 'abceghiko' 'abceghilm' 'abceghiln' 'abceghilo'
Columns 19 through 24
'abcfghijm' 'abcfghijn' 'abcfghijo' 'abcfghikm' 'abcfghikn' 'abcfghiko'
Columns 25 through 27
'abcfghilm' 'abcfghiln' 'abcfghilo'

CAVEAT:
Nested brackets and escaped brackets are not supported.
Only square brackets are supported

IT'S NOT FANCY BUT IT WORKS