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Avoid excessive backtracking in regex engine during fuzzing
The regex engine is prone to excessive backtracking, leading to timeouts, especially while fuzzing. This commit introduces a backtracking counter and a limit of 1000 backtracking steps. When this limit is exceeded during fuzzing, the regex engine aborts to prevent excessive backtracking. For this, the FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION macro is used, as per suggested by the documentation of libFuzzer.
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