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The LENGTH() function returns the length of text that the action is operating on in actions like the Substring action.

The LENGTH() function is a special context sensitive function that only works in a few actions, like the Apply Style action, returning the length of the processed text (so, for example, you could have the text size be dependent on the length of the text).

LENGTH() will not give you the character count of a simple string – for that you can use the Character Count filter.