sql - Extract string between period delimiter -

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i need extract p4534 string below in sql. length between 2 periods can change. need account longer strings between 2 periods when doing substring. how can start @ different position?

<?xml version="1.0" encoding="utf-8"?><mydata>9.9.p4534.2.3</mydata>

the at() function returns integer indicating position of first character character expression.

store '9.9.p4534.2.3' gcstring store 'p4534' gcfindstring substring(gcstring, at(gcfindstring,gcstring), 5)

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