Extend substring function to support pattern matching
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                 Key: CORE-3584
                 URL: http://tracker.firebirdsql.org/browse/CORE-3584
             Project: Firebird Core
          Issue Type: Improvement
          Components: Engine
    Affects Versions: 2.5.0
            Reporter: Ain Valtin
            Priority: Minor


Extend the substring function to support pattern matching, ie

SUBSTRING(str MATCH pattern)

if there is no match return NULL

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