How can i see if a certain identifier is valid in code...

I am still learning about loops but for example i know 32four is not a legal identifier and if i just straight up typed it in a compiler it wouldnt take but like coding wise?
I don't understand the question. What's the difference between "typing it in a compiler" and "coding wise"? The code is necessarily going to go through the compiler. There's no other way to run it.

A valid identifier may contain only letters, numbers, and undescore, and must not start with a number. Additionally, implementations reserve the right to use identifiers starting with an underscore for special purposes.
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