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Expression --+ | Assert
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(expression, invert = 0) A non-consuming assertion using the given expression. The default is a positive lookahead, which matches if the expression matches at the current position, but does not affect the character position. If 'invert' is false, this is a negative lookahead assertion, and matches if the expression does not match. Again, the character position is not affected. |
do a deep copy on this Expression tree
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the corresponding pattern string
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internal function for manipulating the leaves of an expression This really needs to be some sort of visit pattern, but I'm not sure the best way to do it. THIS METHOD MAY CHANGE.
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