Off the top of my head: 

perl -MLingua::EN::Numbers -pe 's/(\d\S+)/Lingua::EN::Numbers::num2en(
+$1) || $1/ge' < input_file > output_file

[download]

This will attempt to change anything that starts with a digit. You might want a more specific pattern. Also, it uses Lingua::EN::Numbers instead of the one you listed (Lingua::Numbers2words, which I didn't find). I haven't tested this.

In reply to Re: change numbers in a corpus into words by kyle
in thread change numbers in a corpus into words by Anonymous Monk

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