Re: Prefixes of regular expressions

On Jun 30, 1:12 am, "Arved Sandstrom" <asandst...@xxxxxxxxxxxxx>
wrote:
Define two regular expressions: one for valid (green), and one for valid
prefix (yellow). Match the supplied string against the first; if matched,
display green. If no match, match against the second. If matched, display
yellow; if no match, display red. You lose nothing in responsiveness with
two regular expressions - this is a user-typed form field after all. And the
logic becomes more clear.

For some situations you could probably use groupCount() on the Matcher
object, with capturing groups, to distinguish between a valid prefix and a
valid complete string.

AHS
Indeed, such an approach would work. But, logically speaking, I only
need
one regular expression to do this, not two. And by using two, I need
to manually
construct the prefix regex based on the whole string regex, when
logically
the former can be derived from the latter.

Maybe its time for a trip to bugs.sun.com... Who knows, I might see
the functionality
I'm after in J2SE 12.0 :)

Simon

.

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