Salesforce Converting 15digits ID to 18 digits ID via Formula

Sometimes you'll need to convert the 15 digits ID to 18 digits for external programs to compare IDs.


ExistingFifteenDigitsId 
& MID("ABCDEFGHIJKLMNOPQRSTUVWXYZ012345",( 
IF(FIND(MID(audit_survey__r.audit__r.Id,1,1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ")>0,1,0) 
+IF(FIND(MID(audit_survey__r.audit__r.Id,2,1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ")>0,2,0) 
+IF(FIND(MID(audit_survey__r.audit__r.Id,3,1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ")>0,4,0) 
+IF(FIND(MID(audit_survey__r.audit__r.Id,4,1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ")>0,8,0) 
+IF(FIND(MID(audit_survey__r.audit__r.Id,5,1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ")>0,16,0) 
)+1,1) 
& MID("ABCDEFGHIJKLMNOPQRSTUVWXYZ012345",( 
IF(FIND(MID(audit_survey__r.audit__r.Id,6,1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ")>0,1,0) 
+IF(FIND(MID(audit_survey__r.audit__r.Id,7,1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ")>0,2,0) 
+IF(FIND(MID(audit_survey__r.audit__r.Id,8,1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ")>0,4,0) 
+IF(FIND(MID(audit_survey__r.audit__r.Id,9,1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ")>0,8,0) 
+IF(FIND(MID(audit_survey__r.audit__r.Id,10,1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ")>0,16,0) 
)+1,1) 
& MID("ABCDEFGHIJKLMNOPQRSTUVWXYZ012345",( 
IF(FIND(MID(audit_survey__r.audit__r.Id,11,1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ")>0,1,0) 
+IF(FIND(MID(audit_survey__r.audit__r.Id,12,1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ")>0,2,0) 
+IF(FIND(MID(audit_survey__r.audit__r.Id,13,1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ")>0,4,0) 
+IF(FIND(MID(audit_survey__r.audit__r.Id,14,1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ")>0,8,0) 
+IF(FIND(MID(audit_survey__r.audit__r.Id,15,1), "ABCDEFGHIJKLMNOPQRSTUVWXYZ")>0,16,0) 
)+1,1)