On 24 Nov 2005, at 11:57, Paul Elschot wrote:
Capturing groups and special contexts need normal brackets ().
Maybe we have a terminology mismatch. I call these (parentheses) and
these [brackets].
Capturing groups are used for replacements, and I don't see a use
for that in a query language.
Right.
Special constructs with () brackets are used for non capturing groups,
match flags, and lookahead/lookbehind.
Would you know a use for these in a query language?
I meant a construct using something like [Tt]his as a "character
class" according to the JDK Pattern documentation.
I also missed things like \u2014, which only add to the problem.
Yeah, I gave up looking for more problems, as there are many.
There are some older regex implementations in java, but I
have no idea about the licences and the availabiility.
Doesn't apache have one somewhere?
Two actually! ORO and Regexp. Here's ORO - <http://
jakarta.apache.org/oro/> (link to Regexp from there)
I'll dig into those soon and see what useful goodies lurk within.
Btw. $ also has a special meaning in regexes.
Quite true.
For my particular query language, I'm not supporting full regex, just
*, ?, and [...] syntax. I convert the expression into regex before
handing it to RegexQuery (* -> .*, ? -> .?).
Erik
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