Pattern recognition in a text field

I am doing some data profiling and want to create a procedure which will provide back the pattern of the data in the text field.  In my first case, this is phone number.  So, for each phone number in a table I have data in, I want to parse through the data element and return the pattern.  For example, if the field was a phone number, I would expect patterns consisting of Numbers (N), Characters (A) and special or delimiting characters.  If I were to pass in data that looked like this:  (123) 234-3456, the return pattern would need to be (NNN) NNN-NNNN.  If the phone looked like this 123.L16.1234, then the return pattern would need to look like this NNN.NNN.NNNN.  I am thinking that the solution will including using regular expressions from Oracle, but I just can't wrap my head around the best way to do this.  Any help would be appreciated.  Thanks!
RobinBuchananAsked:
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SujithData ArchitectCommented:
select replace(regexp_replace(regexp_replace(<your column>, '[0-9]', '~'), '[a-zA-Z]', 'A'), '~', 'N') pattern
from <table>;
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RobinBuchananAuthor Commented:
Thank you!  Very quick response, allows me to proceed with my analysis today!
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SujithData ArchitectCommented:
It was a bit too quick and a bit longer.

Use this version instead.
select regexp_replace(regexp_replace(<your column>, '[a-zA-Z]', 'A') , '[0-9]', 'N') pattern
from <your table>;

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