PCRE: Only remember valid UTF-8 if start offset zero PCRE only validates the string starting from the start offset (minus maximum look-behind, but let's ignore that), so we can only
PCRE: Only remember valid UTF-8 if start offset zero PCRE only validates the string starting from the start offset (minus maximum look-behind, but let's ignore that), so we can only remember that the string is fully valid UTF-8 is the original start offset is zero.
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