FIND ALL OCCURRENCES OF REGEX in internal table

Hello,

I have an internal table with 2Mio. entries. The table has two character fields. Field 1 is key field and field 2 is my search field.

I have to search for a specific  pattern in the second field e.g. find all entries in IT_TABLE where search field contains *XYZ*

So I  use FIND ALL OCCURRENCES OF regex WA_VB1 IN TABLE IT_TABLE RESULTS result_tab

The result_tab contains now all lines which corresponds to the search pattern.

e.g. the result_tab contains now 50.000 entries -> line numers

For each line in the result_tab I need now  the value of the first field from  IT_TABLE -> the key field.

I am seraching for a fast way to get this values.

One possibility is:

Loop at reslult_tab....

  read IT_TABLE.... index result_tab-line.

endloop

But this is very slow.

I am looking for something like:  get all records of IT_TABLE where index is in result_tab-line

Any ideas ?

Please let me also know if you have another idea to find a specifc search pattern in a big table. E.g. find all entries which contain *XYZ*

Thanks