I have a dataset, approximately 7500 observations, where clinicians were requested to enter a treatment plan:

----------------------- copy starting from the next line -----------------------
Code:
* Example generated by -dataex-. To install: ssc install dataex
clear
input str66 q10
"upper arch treatment only"                     
"upper arch treatment only,extraction"          
"upper arch treatment only"                     
"upper and lower arch treatment,extraction"     
"upper arch treatment only,non-extraction"      
"upper arch treatment only,extraction"          
"upper arch treatment only"                     
"upper and lower arch treatment,extraction"     
"upper and lower arch treatment,extraction,other"
"upper arch treatment only"                     
end
------------------ copy up to and including the previous line ------------------

I would like to extract specific treatments such as 'upper and lower arch treatment,extraction'. I have used moss (SSC) and regex:
. li if regexm(q10,"upper and lower arch treatment,extraction")

+-------------------------------------------------+
| q10 |
|-------------------------------------------------|
4. | upper and lower arch treatment,extraction |
8. | upper and lower arch treatment,extraction |
9. | upper and lower arch treatment,extraction,other |
+-------------------------------------------------+

I only need results 4 & 8, the real data set has several additional treatments.

How can I find just the 'upper and lower arch treatment,extraction'

Thank you,
Martyn