Conversion between Python and Arcade

[HusamJubeh]

Conversion between Python and Arcade
I can write an expression in Python to get new data in a specific order through the expression ( !BQCODE![3:5] ) but I do not know how to write that expression in the Arcade language.
Is there anyone who can help?
Gratefully

[DanPatterson]

Function Reference | ArcGIS Arcade | ArcGIS Developers

may be of use.. perhaps the Text portion

[HusamJubeh]

Thank you 
But I want to get to the expression quickly. I searched for it but did not find it.
Can you write the expression here??
Gratefully

[JoshuaBixby]

It helps to provide information about data types and an example or two.

[HusamJubeh]

correct
but I cannot reach the correct expression in Arcade, but in Python I know it

can you help me ؟

Gratefully

[MicZatorsky_AEC · Accepted solution]

In the Calculate Field tool, the Arcade expression 

Mid($feature.BQCODE, 3, 2)

is the equivalent of the Python expression

!BQCODE![3:5]

 Python uses a start index and an end index.  Arcade uses the start index and the number of characters.

[HusamJubeh]

Thank you 😍