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ABAP - Keyword Documentation → ABAP - Reference → Processing Internal Data → Character String and Byte String Processing →Expressions and Functions for String Processing
Expressions and functions for character string processing can be processed at many operand positions.
Note
The advantage that the expressions and functions for string processing have over the statements for character and byte string processing is that expressions can be specified for all operands, which is only possible to a very limited extent in the statements.