How can I count the number of occurrences of a character in a paragraph?

[Gamikey_Store]

How can I count the number of occurrences of a character in a paragraph?
Example: I want to check the number of occurrences of commas in a paragraph:
“182-DISPLU6-Profile 3-disneytest04@gmail.com, 161-DISPLU6-Profile 1-disneytest01@gmail.com, 162-DISPLU6-Profile 2-disneytest02@gmail.com”
I want the return result is 2

[kuovonne]

If your text really is plain text, this formula should work

LEN({fieldname}) - LEN( SUBSTITUTE({fieldname}, ",", "") )

On the other hand, if your text is a lookup field, or a rollup field, this might not work, and there may also be better ways of getting the count.