7.2 search/replace pl/pgsql

Hi all.

Has somebody a pl/pgsql function for search/replace by hand ?
I heard that 7.3 can do this with plain sql, but unfortunately 7.3 is
only available in unstable (debian) at the moment.
So I have to stick to 7.2

A solution which could be easily replaced by the native search/replace
in 7.3 would be nice.

A search/replace with regex would be perfect, but simple string
replacement should be ok for the moment ;)

TIA
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