Oh, it is definitely the case that if the pattern in question is then 
concatenated into a more complex pattern, then '[ab]' is equivalent to 
'(a|b)' but not to 'a|b'.

Consider that the function to which the pattern is given might then be 
searching for, something like '^(?:(.*?)[ab])*(.*)$' or 
'^(?:(.*?)a|b)*(.*)$' to populate \1 \2 … with the various substrings of 
the long string with delimiters.

I suggest that this indicates a bug in the split-string function, which 
ought to wrap the delimiter pattern so that it tells the RE engine to match 
'^(?:(.*?)(?:a|b))*(.*)$' instead.


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