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Previously, when the parser encountered a left or right parenthesis while parsing an atom, it would check if it was either in ERE mode or if the preceding character was a backslash. This is unreliable as we cannot know at this point if said backslash was itself escaped. Instead, when we encounter a backslash (which we know is not escaped), and are not in ERE mode, check if the next character is a left or right parenthesis, and if so, jump directly to the appropriate point.
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Note that there is a similar issue with parsing carets in BREs, but unfortunately it can't be fixed as easily. |
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Previously, when the parser encountered a left or right parenthesis while parsing an atom, it would check if it was either in ERE mode or if the preceding character was a backslash. This is unreliable as we cannot know at this point if said backslash was itself escaped. Instead, when we encounter a backslash (which we know is not escaped), and are not in ERE mode, check if the next character is a left or right parenthesis, and if so, jump directly to the appropriate point.