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Metacharacter
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Matches
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.
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any character except newline
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\n
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newline
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*
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zero or more copies of preceding expression
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+
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one or more copies of preceding expression
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?
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zero or one copy of preceeding expression
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A
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beginning of line
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$
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end of line
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a|b
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a or b
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(ab)+
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one or more copies of ab (grouping)
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"a+b"
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literal “a+b” (C escapes still work)
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[]
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character class
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