Counting commas and semi-colons

Is there any way to count a search item within a string? I’ve got a single line with values in it separated by semi-colons, and I’m trying to determine how many values are in the string. COUNTA() only works with multiple values, not with a single string value. In Filemaker I could do this with PATTERNCOUNT(), but it doesn’t seem there’s an equivalent in Airtable.

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Assuming none of the items includes an embedded semi-colon, this should do it:

(LEN({String}) - LEN(SUBSTITUTE({String},";",""))) + 1

(Formula courtesy @Simon_Brown.)

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PERFECT. Thank you so much.