How can I search for a string/variable after an expression

Hey guys,

I'm working on a program which optimize reports as a project from my university. So it scans reports and try to fix them automatically. I will try to explain my problem with an example:

[random code]

read table l_t009b into wa_t009b with key bdatj = l_jah
bumon = l_mon binary search.

[random code]

So my question is, how can I find 'bdatj' and 'bumon' ? I tried something like this:

READ REPORT v_name INTO source_rep.

FIND ALL OCCURRENCES OF REGEX '(WITH KEY=?)' IN TABLE source_rep IGNORING CASE RESULTS results_tab.

But to be honest i don't know how to get the keys without 'knowing the name of them'.

Have someone an idea?

Greetings

ABAP Development