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20 lines
419 B
20 lines
419 B
4 years ago
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# test re.sub with unmatched groups, behaviour changed in CPython 3.5
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try:
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import ure as re
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except ImportError:
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try:
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import re
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except ImportError:
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print('SKIP')
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raise SystemExit
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try:
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re.sub
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except AttributeError:
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print('SKIP')
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raise SystemExit
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# first group matches, second optional group doesn't so is replaced with a blank
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print(re.sub(r'(a)(b)?', r'\2-\1', '1a2'))
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