Extract substring from filename

[A_San]

I am trying get the frequency from the file name PMS.TDWCPMC.D190402.T1821273 - W (for Weekly).

I am getting the file name using ((String)globalMap.get("tFileList_1_CURRENT_FILE")).

So If I want to extract the frequency from the file name, I try this :

StringUtils.substring(((String)globalMap.get("tFileList_1_CURRENT_FILE")),6,7)

but I am getting this error "Exception in thread "main" java.lang.Error: Unresolved compilation problem: "

Any help would be appreciated.

[TRF · Accepted solution]

Try this one
((String)globalMap.get("tFileList_1_CURRENT_FILE")).substring(6, 7)