SAP REGULAR EXPRESSIONS - Obsolete

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Obsolete Regular Expression Syntax
ABAP supports several syntax flavors for regular expressions. Because of these, the POSIX syntax is obsolete.
Using regular expressions in POSIX syntax leads to a warning from the syntax check that can be hidden by the pragma ##regex_posix. It is recommended that regular expressions are migrated from POSIX to PCRE or another regular expression syntax supported by ABAP.
The PCRE syntax is more powerful than the obsolete POSIX syntax. Furthermore, PCRE regular expressions generally perform better than the POSIX regular expressions supported by ABAP.

POSIX regular expression.

FIND, REPLACE REGEX posix

string_func - regex