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Instring / Substring function in tmap

I want to take substring from one column and map that to the destination table via tamp. I find LEFT and RIGHT functions in string Handling but not the instring. Can anyone clarify?
Example: I want to extract the 6 char from the string starting position 4.
Input column value: 1238AVC957AWC12022007
Output Column value should take AVC957
Twelve Stars

Re: Instring / Substring function in tmap

as alternative - write Your own routine for use Java Substring - StringUtils
some good people do this already on TalendExchange