/y(es)?/i which matches ys or ye also,
No it doesn't. The "es" is optional, so it matches "y" or "yes". Never "ye" or "ys".

-- Randal L. Schwartz, Perl hacker

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119.

In reply to Re: conditional regex by merlyn
in thread conditional regex by Anonymous Monk

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