Using Regular Expressions in Oracle
<Example>
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select regexp_substr('@@/231@@_3253/ABc','@*[[:alnum:]]+',1,2) from dual;
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SELECT REGEXP_SUBSTR (
'RMA(25100001/2) IR(1040855/3) ISO(251000013/1.10) MTI(175709008)',
'[[:alnum:]]+',1,6)
FROM DUAL
----Result-----
3
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