Fix pcre out-of-bounds when using closing symbols as opening delimiter (#12946)

Apparently we support using closing symbols )]}> as opening and closing
delimiters.

Fixes oss-fuz

Fix pcre out-of-bounds when using closing symbols as opening delimiter (#12946)

Apparently we support using closing symbols )]}> as opening and closing
delimiters.

Fixes oss-fuzz #65021

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