Substring Function in Design Studio

Hello all,
I have a question. Is there any substring like function in Design Studio because I have a string and I need to cut the part of the string on the dashboard to show.
For Example
My String: HELLO
I only want to get "EL" from that string and show that on the dashboard.
Is that possible?
I appreciate your help in advanced. Thanks.

Zahid,
As Tammy mentioned Help document has it all.
You can find it in Help of Design Studio application itself.

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