preg_match(): Compilation failed: invalid range in character class at offset

Question

Thank you in advance for you time in helping with this issue..

preg_match(): Compilation failed: invalid range in character class at offset 20 sessio

Answer 1

Your error is dependent on your regex interpreter.

You can escape hyphen to be clear about its use. Meaning using \- instead of -.

Your final code:

/^[a-z0-9]([0-9a-z_\-\s])+$/i