fix: Unescape Unicode Characters accepts 4-6 hex digits for U+ prefix#2287
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The U+ prefix regex was hardcoded to exactly 4 hex digits, rejecting
valid astral plane codepoints like U+1F600 and zero-padded forms like
U+000041. Widen the quantifier to {4,6} for U+ only; \u and %u retain
their fixed 4-digit requirement.
Closes gchq#2242
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The U+ prefix regex was hardcoded to exactly 4 hex digits, rejecting valid astral plane codepoints like U+1F600 and zero-padded forms like U+000041. Widen the quantifier to {4,6} for U+ only; \u and %u retain their fixed 4-digit requirement.
Closes #2242
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