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plsql question

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I am trying to write a plsql routine that will delete a range of characters based on their octal or hexadecimal values. Something like the 'tr' shell command will do:

cat file| tr -d ['\177'-'\377']

Can't seem to figure this one out.

Pointers would be appreciated.

--
Until later, Geoffrey

"I predict future happiness for America if they can prevent
the government from wasting the labors of the people under
the pretense of taking care of them."
- Thomas Jefferson

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