substr - How can I extract a substring from a string in Oracle, starting from a specific character? -

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i need extract substring string in oracle.

for example, need extract string "dha-f-0046789" "ra_pvac000275994.from.ins012.to.dha-f-0046789.file.1.2.xml".

i not want use position of characters extract substring because substring i'd extract may @ different positions in string. text wish extract may @ beginning of string.

sometimes substring wish extract may in format "f-dha-sds89" rather "dha-f-0046789".

select substr ( &param, instr(&param,'to.',1)+3, instr(substr(&param,instr(&param,'to.',1)+3),'.',1)-1 ) dual;


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