[xquery-talk] Regular Expression search

Jason Hunter jhunter at xquery.com
Thu Dec 15 10:24:56 PST 2005

John Snelson wrote:

> Hi Martin,
> I've used the MarkLogic database. However, the custom ctd:contains() 
> function is not quite the same as the full regular expressions accepted 
> by fn:matches(), is it?

You've got it, because regular expressions are flat character oriented 
while cts:contains() and the cts:* functions are token oriented.

> Does MarkLogic use it's indexes to optimise fn:matches()?

To the degree it can, but complicated regexps don't lend themselves to 
general index optimization.


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