Hi STATALIS

I want to select patients with "IAM" in the studydescription_all variable . The "studydescription_all" variable is a text variable.
I'm wondering why "CT Trauma C/A/P & T/L Spine C+" was selected?

Regards,


Code:
gen Head_IAM=.
replace Head_IAM=1 if (regexm(studydescription_all, ("[i/I][a/A][m/M]")))
Code:
studydescription_all                          Head_IAM
CT Trauma C/A/P & T/L Spine C+                  1
CT TempBone/IAM(+/-Brain) - C                    1
CT IAM                                             1