Fixed PCRE2 error message #3279
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In case an error occurs in PCRE2 compilation, the error message is not displayed.
Example: "Error creating rule: Error compiling pattern (offset 6): "
With the fix, the PCRE2 error message is retrieved:
Example: "Error creating rule: Error compiling pattern (offset 6): length of lookbehind assertion is not limited"
The code was mimicing PCRE behaviour; PCRE2 error message handling changed.