I think IDEA actually splits a CamelCase identifier and expects your input to be a concatenation of prefixes of these parts, in the correct order, but parts may

I think IDEA actually splits a CamelCase identifier and expects your input to be a concatenation of prefixes of these parts, in the correct order, but parts may be omitted. Though the latest version goes further and also detects flipped characters, so maybe levenshtein distance on top of that.