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    <p>I'm not quite clear on whether you want exact matches or sub-string matches so I've included various options:</p> <p><a href="http://sqlfiddle.com/#!4/6b970/22" rel="noreferrer">SQL Fiddle</a></p> <p><strong>Oracle 11g R2 Schema Setup</strong>:</p> <pre><code>CREATE TABLE MY_TABLE (MY_COLUMN) AS SELECT '456' FROM DUAL UNION ALL SELECT '12345678' FROM DUAL UNION ALL SELECT 'abc 123 def 456' FROM DUAL; </code></pre> <p><strong>Query 1</strong>:</p> <p>If you only want rows where <code>MY_COLUMN</code> contains exactly a 3-digit number then you can just use your regular expression wrapped in the start-string (<code>^</code>) and end-string (<code>$</code>) anchors:</p> <pre><code> SELECT MY_COLUMN FROM MY_TABLE WHERE REGEXP_LIKE( MY_COLUMN, '^[[:digit:]]{3}$' ) </code></pre> <p><strong><a href="http://sqlfiddle.com/#!4/6b970/22/0" rel="noreferrer">Results</a></strong>:</p> <pre><code>| MY_COLUMN | |-----------| | 456 | </code></pre> <p><strong>Query 2</strong>:</p> <p>Or, if you are using Oracle 11g then you can use the less verbose PERL syntax:</p> <pre><code> SELECT MY_COLUMN FROM MY_TABLE WHERE REGEXP_LIKE( MY_COLUMN, '^\d{3}$' ) </code></pre> <p><strong><a href="http://sqlfiddle.com/#!4/6b970/22/1" rel="noreferrer">Results</a></strong>:</p> <pre><code>| MY_COLUMN | |-----------| | 456 | </code></pre> <p><strong>Query 3</strong>:</p> <p>If you want to extract the first 3-digit number from the column (where it can have surrounding text or more digits), then:</p> <pre><code> SELECT MY_COLUMN, REGEXP_INSTR( MY_COLUMN, '\d{3}' ), REGEXP_SUBSTR( MY_COLUMN, '\d{3}' ) FROM MY_TABLE WHERE REGEXP_LIKE( MY_COLUMN, '\d{3}' ) </code></pre> <p><strong><a href="http://sqlfiddle.com/#!4/6b970/22/2" rel="noreferrer">Results</a></strong>:</p> <pre><code>| MY_COLUMN | REGEXP_INSTR(MY_COLUMN,'\D{3}') | REGEXP_SUBSTR(MY_COLUMN,'\D{3}') | |-----------------|---------------------------------|----------------------------------| | 456 | 1 | 456 | | 12345678 | 1 | 123 | | abc 123 def 456 | 5 | 123 | </code></pre> <p><strong>Query 4</strong>:</p> <p>If you want to extract the first exactly 3-digit number from the column then:</p> <pre><code> SELECT MY_COLUMN, REGEXP_SUBSTR( REGEXP_SUBSTR( MY_COLUMN, '(^|\D)\d{3}(\D|$)' ), '\d{3}' ) AS match FROM MY_TABLE WHERE REGEXP_LIKE( MY_COLUMN, '(^|\D)\d{3}(\D|$)' ) </code></pre> <p><strong><a href="http://sqlfiddle.com/#!4/6b970/22/3" rel="noreferrer">Results</a></strong>:</p> <pre><code>| MY_COLUMN | MATCH | |-----------------|-------| | 456 | 456 | | abc 123 def 456 | 123 | </code></pre> <p><strong>Query 5</strong>:</p> <p>If you want to extract all the non-overlapping 3-digit numbers from the column (where it can have surrounding text), then:</p> <pre><code> WITH re_counts AS ( SELECT MY_COLUMN, REGEXP_COUNT( MY_COLUMN, '\d{3}' ) AS re_count FROM MY_TABLE ) ,indexes AS ( SELECT LEVEL AS "index" FROM DUAL CONNECT BY LEVEL &lt;= (SELECT MAX( re_count) FROM re_counts) ) SELECT MY_COLUMN, "index", REGEXP_SUBSTR( MY_COLUMN, '\d{3}', 1, "index" ) FROM re_counts INNER JOIN indexes ON ("index" &lt;= re_count) ORDER BY MY_COLUMN, "index" </code></pre> <p><strong><a href="http://sqlfiddle.com/#!4/6b970/22/4" rel="noreferrer">Results</a></strong>:</p> <pre><code>| MY_COLUMN | INDEX | REGEXP_SUBSTR(MY_COLUMN,'\D{3}',1,"INDEX") | |-----------------|-------|--------------------------------------------| | 12345678 | 1 | 123 | | 12345678 | 2 | 456 | | 456 | 1 | 456 | | abc 123 def 456 | 1 | 123 | | abc 123 def 456 | 2 | 456 | </code></pre> <p><strong>Query 6</strong>:</p> <p>If you want to extract all the sub-matches which are exactly 3-digit numbers then:</p> <pre><code> WITH re_counts AS ( SELECT MY_COLUMN, REGEXP_COUNT( MY_COLUMN, '(^|\D)\d{3}(\D|$)' ) AS re_count FROM MY_TABLE ) ,indexes AS ( SELECT LEVEL AS "index" FROM DUAL CONNECT BY LEVEL &lt;= (SELECT MAX( re_count) FROM re_counts) ) SELECT MY_COLUMN, "index", REGEXP_SUBSTR( REGEXP_SUBSTR( MY_COLUMN, '(^|\D)\d{3}(\D|$)', 1, "index" ), '\d{3}' ) AS match FROM re_counts INNER JOIN indexes ON ("index" &lt;= re_count) ORDER BY MY_COLUMN, "index" </code></pre> <p><strong><a href="http://sqlfiddle.com/#!4/6b970/22/5" rel="noreferrer">Results</a></strong>:</p> <pre><code>| MY_COLUMN | INDEX | MATCH | |-----------------|-------|-------| | 456 | 1 | 456 | | abc 123 def 456 | 1 | 123 | | abc 123 def 456 | 2 | 456 | </code></pre> <p><strong>Query 7</strong>:</p> <p>If you want to extract all 3-digit numbers from a column regardless of whether those matches partially overlap or not then:</p> <pre><code> WITH positions AS ( SELECT LEVEL AS pos FROM DUAL CONNECT BY LEVEL &lt;= (SELECT MAX( LENGTH( MY_COLUMN ) - 2 ) FROM MY_TABLE ) ) SELECT MY_COLUMN, pos, SUBSTR( MY_COLUMN, pos, 3 ) FROM MY_TABLE INNER JOIN positions ON (pos &lt;= LENGTH( MY_COLUMN ) - 2 ) WHERE REGEXP_LIKE( SUBSTR( MY_COLUMN, pos, 3 ), '^\d{3}$' ) ORDER BY MY_COLUMN, pos </code></pre> <p><strong><a href="http://sqlfiddle.com/#!4/6b970/22/6" rel="noreferrer">Results</a></strong>:</p> <pre><code>| MY_COLUMN | POS | SUBSTR(MY_COLUMN,POS,3) | |-----------------|-----|-------------------------| | 12345678 | 1 | 123 | | 12345678 | 2 | 234 | | 12345678 | 3 | 345 | | 12345678 | 4 | 456 | | 12345678 | 5 | 567 | | 12345678 | 6 | 678 | | 456 | 1 | 456 | | abc 123 def 456 | 5 | 123 | | abc 123 def 456 | 13 | 456 | </code></pre>
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    1. POFind a number with Oracle regexp that has an exact length of 3
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    1. COThanks a lot. Good hackink...
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      1. USrobert lennon
 

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