I would recommend using XPath Extractor instead as regular expressions are pretty dependent on layout, attributes order, spaces, etc. and can be a real headache to develop and test for non-experienced used. Especially multi-line ones.
XPath expression for extracting value from as_fid
input will look like:
//input[@id='OrderProducts_1__TempOrderProductGuid']/@value
Some clues:
- If you're using JMeter 2.11 you'll be able to test your XPath expressions right in View Results Tree Listener
- You may need to check "Use Tidy" box in XPath Extractor if your HTML isn't XHTML compliant
- Check XPath Tutorial for language reference.