Re: xpath string index function

On 2011-09-28, at 14:07, Sandro Hawke wrote:

> As discussed in yesterday's telecon, I asked an expert (Liam Quin, XML
> activity lead), who confirmed there is no function in xpath to find the
> position of a string inside another one, and that people string-before,
> and can just use the length of that if they really need the position.

I note that will give you the 0-based offset of the string :)

Also, fn:substring-before returns a zero-length string in the case of a non-match, so it's rather tricky to work with:

IF(fn:starts-with(?x, "foo") || fn:string-length(fn:substring-before(?x, "foo")) > 0, fn:string-length(fn:substring-before(?x, "foo")) + 1, 0)

…or something like it will give you the 1-based index of a substring.

- Steve

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Received on Wednesday, 28 September 2011 13:27:20 UTC