How to remove special characters ?
Input - ['' ABC "]
I want result - ABC
Hi, and welcome to the forum! 
Your input looks like it may be from a Text Blaze list, If it is, you can use [1] to access the first element of the list.
If it's not from a list, you can use a regular expression remove the non alphabetic characters:
Here is an example showing both solutions:
{formtext: name=input; default=[" ABC "]}
Approach 1: Access the first element of a Text Blaze list:
{=input[1]}
Approach 2: Remove all non alphabetic characters:
{=replaceregex(input, "[^A-Za-z]", "", "g")}
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