this test needs json

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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PCRE: Check whether start offset is on char boundary

We need not just the whole string to be UTF-8, but the start
position to be on a character boundary as well. Check this by
lookin

PCRE: Check whether start offset is on char boundary

We need not just the whole string to be UTF-8, but the start
position to be on a character boundary as well. Check this by
looking for a continuation byte.

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