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-rw-r--r--Lib/regex_syntax.py53
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-"""Constants for selecting regexp syntaxes for the obsolete regex module.
-
-This module is only for backward compatibility. "regex" has now
-been replaced by the new regular expression module, "re".
-
-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.)