JayBizzle / Crawler-Detect / 25689254814

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Drop unused capture group and memoize compiled regex (#605)

The outer parentheses around the alternation produced a capturing group
whose backreference was never read — preg_match's $matches[0] returns
the full match regardless. Switched to (?:...) so PCRE doesn't have to
allocate the group.

Also added a process-wide static cache for the compiled pattern string,
keyed by hash of the pattern list. Repeated `new CrawlerDetect` calls
(common in per-request frameworks) now skip the implode of the
~1500-entry crawler list after the first instance.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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