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* Called when the parser finds a backslash not followed
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* by a valid expression (like \( in non-Posix mode).
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* @param incr: (out) number of chars to skip after expression evaluation.
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* @return the char if it resolves to a simple char,
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* or -1 for a char class. In this case, bittab is changed.
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int RESearch::GetBackslashExpression(
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// Since error reporting is primitive and messages are not used anyway,
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// I choose to interpret unexpected syntax in a logical way instead