UNIX for Dummies Questions & Answers

Hi,
Within a UNIX shell script I need to extract a value from an XML field. The field will contain different values but will always be 6 digits in length. E.g.:

<provider-id>999999</provider-id>

I've tried various ways but no luck. Any ideas how I might get the provider id (in this case 999999) out of the file?

Thanks
Paul

Code:

perl -nle 'print /(?<=<provider-id>).*?(?=<\/provider-id>)/g' file

Thanks, that works great!