/ABC[^XYZ]*(XYZ)/
I really like using regex pal to test these things out, while you play around with them to find something that works: http://www.regexpal.com/
Starting with ABC, any number of things that aren't XYZ, and ending with XYZ (there's probably a way to do it with forward-lookahead match groups, but my regex fu isn't that powerful).
Testing it out:
I really like using regex pal to test these things out, while you play around with them to find something that works: http://www.regexpal.com/
Starting with ABC, any number of things that aren't XYZ, and ending with XYZ (there's probably a way to do it with forward-lookahead match groups, but my regex fu isn't that powerful).
Testing it out:
>>> import re
>>> tests = [
... 'lmnoqABCrstuvwXYZdefghijk)',
... 'missing_start_groupXYZ',
... 'missing_end_ABC_group',
... 'missing_both'
... ]
>>> for test in tests:
... match = re.search("ABC[^XYZ]*(XYZ)", test, re.IGNORECASE)
... print(match)
... if match:
... print(match.groups())
...
<_sre.SRE_Match object; span=(5, 17), match='ABCrstuvwXYZ'>
('XYZ',)
None
None
None
>>>