[xsl] replacing parts of a string

["Jonny Pony" <jonnypony666@xxxxxxxxxxx>]

Hi,

Is there a (string)-replace function in xsl. Couldn't find one.
My problem: I get something like this in xml:
<LongString>wert,dsfg,dsfg,ewrt,wert,xcvbs,rwete,ehgfh,xxxxxasd,awersdf,dfgxvxcv</LongString>

I want to have a whitespace between the "," and the text.

Thanks
jonny

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