There's no source code because it's shipped precompiled (probably in some .so files).
Only TD engeneering can install functions in td_sysfnlib.
If you had the source code it would not work on TD13, as those fastpath functions are called differently (without a stack) from user UDFs.
Of course you could wrap a C-implementation of REGEXP_REPLACE in a TD UDF, but execution will be slower.
Dieter
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