>Hi Gregory,
>
>I've run that code, but it doesn't do what I need. I want to replace the numbers with X, e.g. the resulting string should be
>'abcXXXXXXXXXXXXXXXXfd'

Shouldn't be difficult, use option (2) slightly altered

>>&& or with Execute()
>>lcString = 'abc1234567890123456'
>>
>>matchesObj = m.loRegExp.Execute(m.lcString)
>>
>>? 'old: ', m.lcString 
>>
>>for i = m.matchesObj.Count - 1 to 0 step -1
>>	match = m.matchesObj.item(m.i)
>>	
>>	
>>	
>>	?match.Submatches.Count
>>	?match.Submatches[0]
>>	?match.Submatches[1]
>>	?match.Submatches[2]
>>
>>&&	s = m.match.Submatches[0] + m.match.Submatches[1] + 'X' + match.Submatches[2]



	s = m.match.Submatches[0] + repl('X',  len( m.match.Submatches[1] )) + m.match.Submatches[2]



>>	lcString = stuff(m.lcString, m.match.FirstIndex+1, m.match.Length, m.s)
>>	
>>	
>>endfor
>>? 'new: ', m.lcString 
>>