The "Trim" Post-Processing function can be used in agents. Where, I want to remove comma separated characters from both side of the string. For example, I have this scraping agent "TrimStart Function Example(Post-Processing)" in my account and I want to remove (') characters from both side of the string in each row of the field "Contact" using "trim" post-processing function.

Before:

Steps:

1. Edit the scraping agent by clicking on the "Edit" tab.
2. Go to the field "Contact" and click on the "Edit field" button
3. Now, click on the "Add Post-Processing" button and add the "Trim" post-processing function as the following screenshot given.
   
   
    
4. This function requires "Chars" input parameter
5. Now enter the ' text as parameter.
6. And "Save" the function and the scraping agent configuration.
7. Then, finally re-run  your agent to apply the changes.

After "Trim" Function:

If you notice the "Contact" field of the screenshot below, you find that the comma separated characters is removed using "Trim" post-processing function.