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Match Expand Tests
==================
Match objects have an .expand() method which allows them to
expand templates as if the .sub() method was called on the pattern.
>>> import re2
>>> re2.set_fallback_notification(re2.FALLBACK_EXCEPTION)
>>> m = re2.match("(\\w+) (\\w+)\\W+(?P<title>\\w+)", "Isaac Newton, physicist")
>>> m.expand("\\2, \\1")
'Newton, Isaac'
>>> m.expand("\\1 \\g<title>")
'Isaac physicist'
>>> m.expand("\\2, \\1 \\2")
'Newton, Isaac Newton'
>>> m.expand("\\3")
'physicist'
>>> m.expand("\\1 \\g<foo>") # doctest: +IGNORE_EXCEPTION_DETAIL +ELLIPSIS
Traceback (most recent call last):
...
IndexError: no such group 'foo'; available groups: ['title']
>>> m.expand("\\0")
'\x00'
>>> m.expand("\01")
'\x01'
>>> m.expand('\t\n\x0b\r\x0c\x07\x08\\B\\Z\x07\\A\\w\\W\\s\\S\\d\\D')
'\t\n\x0b\r\x0c\x07\x08\\B\\Z\x07\\A\\w\\W\\s\\S\\d\\D'
>>> re2.set_fallback_notification(re2.FALLBACK_QUIETLY)
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