Choose a delimiter which does not occur in the character string

What causes this issue?

The characters <LB>+-.,;:#*/()<></> are data delimiters for search and
replace strings.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

If search/replace strings contain a space or a data delimiter, they
must be included into (other) data delimiters.

Error message extract from SAP system. Copyright SAP SE.