Regular Expression to match a pattern that doesn't starts with an alpha-numeric character

Question

Suppose, I have the following patterns:

var firstPtrn = "3&s7eb";
var secondPtrn = "#u3_a7";

Now, I want a Regex that doesn't match a pattern starting with an alpha-numeric character (it can be special symbols, underscore, etc). For example, the secondPtrn. You can use any language!

Note: This is not an assignment, just a normal question.

Answer 1

https://code.sololearn.com/cCKx40XejS8j/?ref=app