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