Using regular expressions in stylesheet

>>>> Hello,
**** Command 'hello,' not recognized.
>>>> 
>>>> I am new to XSLT technology and would like to find out whether the
latest
**** Command 'i' not recognized.
Hello,

I am new to XSLT technology and would like to find out whether the latest
version of XPath already supports regular expressions (I am currently using
Xalan for transformations).
I would like to use regular expressions to extract digits out of a string
containing alphanumeric characters (for example, extract '5' out of '5a').
Can you tell me of an appropriate function that allows me to do this in my
stylesheet? 
Would really appreciate some feedback.

Regards,
Trang

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