Surprising Regex Match of ^ and special character

My regular expression is designed to break down calculator input strings, such as 12+3.4x5, into individual tokens like 12, +, 3.4, x, and 5

Here is the regular expression I am using:

\d+\.?\d+|[\+-÷x]

However, I am encountering unexpected matches with symbols like ^ and letters.

https://i.stack.imgur.com/Y6xiV.png

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