Snake_Case Regex

Example:

^[a-z]+(_[a-z]+)*$

Matches:
✓ snake_case
✓ my_variable_name
✗ kebab-case (hyphens)

Match snake_case: ^[a-z]+(_[a-z]+)*$

Try Regex Lab →

FAQs

Allow uppercase (SCREAMING_SNAKE_CASE)?

Use: ^[A-Z]+(_[A-Z]+)*$