corrected misleading variable name

[hiteshbedre]

When we define ^ in a square bracket it negate the matches.
Example:
[^abc] : matches any char except a, b or c.
[^a-z] : matches any character except lower alphabets
[^a-z0-9] : matches any character except lower alphabets and numbers

So changed name of variable to non_alphanumeric.
Here I have created playground for same scenario: https://regex101.com/r/zmEBu2/1

[hiteshbedre]

If I assume you wanted to match only alphanumeric string only then we just need alter the pattern to [a-z0-9] keeping variable name same.