Does UltraEdit software has keyword search function?

UltraEdit software is achievable

You can select the "List lines containing string" option under the Find option (shown below)

Examples are as follows:

If you want to search for a variable named: if_EmergencyStop, click on the search, in the dialog box, will list all the information used to the name of the variable,

If you want to see where to call, just click on the corresponding line that appears in the window to connect to the actual call.