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POReplacing Text which does not match a pattern in Oracle
primarykey
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17340363
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17443175
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2
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2013-06-27T10:10:01.260
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2013-07-03T08:29:13.510
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2013-06-28T09:34:34.563
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1
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text
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I have below text in a CLOB in a table Table Name: tbl1 Columns col1 - number (Primary Key) col2 - clob (as below) Row#1 ----- Col1 = 1 Col2 = 1331882981,ab123456,Some text here which can run multiple lines and have a lot of text... ~1331890329,pqr123223,Some more text... Row#2 ----- Col1 = 2 Col2 = 1331882981,abc333,Some text here which can run multiple lines and have a lot of text... ~1331890329,pqrs23,Some more text... Now I need to know how we can get below output Col1 Value ---- --------------------- 1 1331882981,ab123456 1 1331890329,pqr123223 2 1331882981,abc333 2 1331890329,pqrs23 ([0-9]{10},[a-z 0-9]+.), ==> This is the regular expression to match "1331890329,pqrs23" and I need to know how can replace which are not matching this regex and then split them into multiple rows EDIT#1 I am on Oracle 10.2.0.5.0 and hence cannot use REGEXP_COUNT function :-( Also, the col2 is a CLOB which is massive EDIT#2 I've tried below query and it works fine for some records (i.e. if I add a "where" clause). But when I remove the "where", it never returns any result. I've tried to put this into a view and insert into a table and left it run overnight but still it had not completed :( <pre><code>with t as (select col1, col2 from temp_table) select col1, cast(substr(regexp_substr(col2, '[^~]+', 1, level), 1, 50) as varchar2(50)) data from t connect by level <= length(col2) - length(replace(col2, '~')) + 1 </code></pre> EDIT#3 <pre> # of Chars in Clob Total ----------- ----- 0 - 1k 3196 1k - 5k 2865 5k - 25k 661 25k - 100k 36 > 100k 2 ----------- ----- Grand Total 6760 </pre> I have ~7k rows of clobs which have the distribution as shown above...
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Replacing Text which does not match a pattern in Oracle
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