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def | __init__ (self, expr, default=_optionalNotMatched) |
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def | parseImpl (self, instring, loc, doActions=True) |
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def | __str__ (self) |
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def | leaveWhitespace (self) |
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def | ignore (self, other) |
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def | streamline (self) |
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def | checkRecursion (self, parseElementList) |
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def | validate (self, validateTrace=[]) |
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def | __init__ (self, savelist=False) |
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def | copy (self) |
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def | setName (self, name) |
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def | setResultsName (self, name, listAllMatches=False) |
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def | setBreak (self, breakFlag=True) |
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def | setParseAction (self, *fns, **kwargs) |
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def | addParseAction (self, *fns, **kwargs) |
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def | addCondition (self, *fns, **kwargs) |
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def | setFailAction (self, fn) |
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def | preParse (self, instring, loc) |
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def | postParse (self, instring, loc, tokenlist) |
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def | tryParse (self, instring, loc) |
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def | canParseNext (self, instring, loc) |
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def | parseString (self, instring, parseAll=False) |
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def | scanString (self, instring, maxMatches=_MAX_INT, overlap=False) |
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def | transformString (self, instring) |
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def | searchString (self, instring, maxMatches=_MAX_INT) |
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def | split (self, instring, maxsplit=_MAX_INT, includeSeparators=False) |
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def | __add__ (self, other) |
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def | __radd__ (self, other) |
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def | __sub__ (self, other) |
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def | __rsub__ (self, other) |
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def | __mul__ (self, other) |
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def | __rmul__ (self, other) |
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def | __or__ (self, other) |
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def | __ror__ (self, other) |
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def | __xor__ (self, other) |
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def | __rxor__ (self, other) |
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def | __and__ (self, other) |
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def | __rand__ (self, other) |
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def | __invert__ (self) |
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def | __call__ (self, name=None) |
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def | suppress (self) |
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def | setWhitespaceChars (self, chars) |
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def | parseWithTabs (self) |
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def | setDebugActions (self, startAction, successAction, exceptionAction) |
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def | setDebug (self, flag=True) |
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def | __repr__ (self) |
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def | parseFile (self, file_or_filename, parseAll=False) |
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def | __eq__ (self, other) |
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def | __ne__ (self, other) |
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def | __hash__ (self) |
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def | __req__ (self, other) |
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def | __rne__ (self, other) |
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def | matches (self, testString, parseAll=True) |
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def | runTests (self, tests, parseAll=True, comment='#', fullDump=True, printResults=True, failureTests=False) |
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Optional matching of the given expression.
Parameters:
- expr - expression that must match zero or more times
- default (optional) - value to be returned if the optional expression is not found.
Example::
# US postal code can be a 5-digit zip, plus optional 4-digit qualifier
zip = Combine(Word(nums, exact=5) + Optional('-' + Word(nums, exact=4)))
zip.runTests('''
# traditional ZIP code
12345
# ZIP+4 form
12101-0001
# invalid ZIP
98765-
''')
prints::
# traditional ZIP code
12345
['12345']
# ZIP+4 form
12101-0001
['12101-0001']
# invalid ZIP
98765-
^
FAIL: Expected end of text (at char 5), (line:1, col:6)