Re: [xsl] efficiently extracting a capture group from analyze-string()

["Graydon graydon@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

On Sat, Jun 04, 2022 at 03:30:03PM -0000, Chris Papademetrious christopher.papademetrious@xxxxxxxxxxxx scripsit:
> Hi everyone!
> 
> Given some filename string like
> 
>   <xsl:variable name="file" select="'path/my-sometype.xml'"/>
> 
> Ibd like to extract the bmy-(\w+)b part of the filename using analyze-string().

I would recommend against trying to do this with general application of
a single regular expression.

If you only want something that starts with 'my-' and you're confident
no other path component has 'my-' in it, it'd be:

tokenize($file,'/')[starts-with(.,'my-')]

possibly

tokenize($file,'/')[matches(.,'my-','i')]

if you're not sure it's exactly 'my-'.

Or, classically,

tokenize($file,system-property('file.separator'))[last()]

or if your processor gives you access to the file EXPath module
( http://expath.org/spec/file ) it's modernly

file:name($file)

Standard and library functions always have better test cases; use them
if you can.

-- 
Graydon Saunders  | graydonish@xxxxxxxxx
CC&s oferC)ode, C0isses swC! mC&g.
-- Deor  ("That passed, so may this.")