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"""Constants for selecting regexp syntaxes for the obsolete regex module.
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This module is only for backward compatibility. "regex" has now
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been replaced by the new regular expression module, "re".
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These bits are passed to regex.set_syntax() to choose among
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alternative regexp syntaxes.
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"""
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# 1 means plain parentheses serve as grouping, and backslash
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# parentheses are needed for literal searching.
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# 0 means backslash-parentheses are grouping, and plain parentheses
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# are for literal searching.
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RE_NO_BK_PARENS = 1
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# 1 means plain | serves as the "or"-operator, and \| is a literal.
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# 0 means \| serves as the "or"-operator, and | is a literal.
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RE_NO_BK_VBAR = 2
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# 0 means plain + or ? serves as an operator, and \+, \? are literals.
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# 1 means \+, \? are operators and plain +, ? are literals.
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RE_BK_PLUS_QM = 4
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# 1 means | binds tighter than ^ or $.
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# 0 means the contrary.
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RE_TIGHT_VBAR = 8
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# 1 means treat \n as an _OR operator
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# 0 means treat it as a normal character
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RE_NEWLINE_OR = 16
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# 0 means that a special characters (such as *, ^, and $) always have
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# their special meaning regardless of the surrounding context.
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# 1 means that special characters may act as normal characters in some
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# contexts. Specifically, this applies to:
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# ^ - only special at the beginning, or after ( or |
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# $ - only special at the end, or before ) or |
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# *, +, ? - only special when not after the beginning, (, or |
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RE_CONTEXT_INDEP_OPS = 32
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# ANSI sequences (\n etc) and \xhh
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RE_ANSI_HEX = 64
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# No GNU extensions
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RE_NO_GNU_EXTENSIONS = 128
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# Now define combinations of bits for the standard possibilities.
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RE_SYNTAX_AWK = (RE_NO_BK_PARENS | RE_NO_BK_VBAR | RE_CONTEXT_INDEP_OPS)
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RE_SYNTAX_EGREP = (RE_SYNTAX_AWK | RE_NEWLINE_OR)
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RE_SYNTAX_GREP = (RE_BK_PLUS_QM | RE_NEWLINE_OR)
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RE_SYNTAX_EMACS = 0
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# (Python's obsolete "regexp" module used a syntax similar to awk.)
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