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1 # These bits are passed to regex.set_syntax() to choose among
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2 # alternative regexp syntaxes.
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3
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4 # 1 means plain parentheses serve as grouping, and backslash
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5 # parentheses are needed for literal searching.
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6 # 0 means backslash-parentheses are grouping, and plain parentheses
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7 # are for literal searching.
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8 RE_NO_BK_PARENS = 1
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9
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10 # 1 means plain | serves as the "or"-operator, and \| is a literal.
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11 # 0 means \| serves as the "or"-operator, and | is a literal.
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12 RE_NO_BK_VBAR = 2
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13
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14 # 0 means plain + or ? serves as an operator, and \+, \? are literals.
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15 # 1 means \+, \? are operators and plain +, ? are literals.
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16 RE_BK_PLUS_QM = 4
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17
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18 # 1 means | binds tighter than ^ or $.
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19 # 0 means the contrary.
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20 RE_TIGHT_VBAR = 8
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21
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22 # 1 means treat \n as an _OR operator
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23 # 0 means treat it as a normal character
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24 RE_NEWLINE_OR = 16
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25
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26 # 0 means that a special characters (such as *, ^, and $) always have
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27 # their special meaning regardless of the surrounding context.
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28 # 1 means that special characters may act as normal characters in some
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29 # contexts. Specifically, this applies to:
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30 # ^ - only special at the beginning, or after ( or |
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31 # $ - only special at the end, or before ) or |
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32 # *, +, ? - only special when not after the beginning, (, or |
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33 RE_CONTEXT_INDEP_OPS = 32
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34
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35 # Now define combinations of bits for the standard possibilities.
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36 RE_SYNTAX_AWK = (RE_NO_BK_PARENS | RE_NO_BK_VBAR | RE_CONTEXT_INDEP_OPS)
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37 RE_SYNTAX_EGREP = (RE_SYNTAX_AWK | RE_NEWLINE_OR)
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38 RE_SYNTAX_GREP = (RE_BK_PLUS_QM | RE_NEWLINE_OR)
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39 RE_SYNTAX_EMACS = 0
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40
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41 # (Python's obsolete "regexp" module used a syntax similar to awk.)
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