# 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.)