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regular expression - Mailing list pgsql-sql

From gurkan@resolution.com
Subject regular expression
Date
Msg-id 1128377310.4341abde55776@www.resolution.com
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Responses Re: regular expression
Re: regular expression
List pgsql-sql
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How do I do regular expression for the problem that I am having
I have a string called desc, and say that this string in 

"TSWUU"          ------ ""
"4 - DSC"        ------ "4"
"6768 - THY"     ------ "6768"
basically string may or may not start with number, 
I need substring of digits parts
""
"4"
"6768"

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