z/OS TSO/E REXX Reference
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INDEX, POS, and LASTPOS

z/OS TSO/E REXX Reference
SA32-0972-00 

INDEX('<.A><.B><><.C.D.E>','<.D.E>')    ->   4
POS('<.A>','<.A><.B><><.A.D.E>')        ->   1
LASTPOS('<.A>','<.A><.B><><.A.D.E>')    ->   3

Applying the character extraction from a string and character comparison rules.

Parent topic: Built-in Function Examples

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