Validation

Email Local Part (Before @)

Validate just the local part of an email address (the bit before the @).

Try it in RegexPro →

Available in

JSSupported

JavaScript / ECMAScript

Browser-native RegExp. Default if you don't pick.

PYSupported

Python (re)

CPython stdlib `re`. Unicode-aware `\w` and `\d` by default.

GOSupported

Go (RE2)

Linear-time matching. No backreferences or lookarounds.

Pattern

regexengine-agnostic
^[a-zA-Z0-9._%+\-]{1,64}$

Raw source: ^[a-zA-Z0-9._%+\-]{1,64}$

How it works

^ and $ anchor to the full string. [a-zA-Z0-9._%+\-] is the conservative local-part character set (dots, underscores, percent, plus, hyphen for sub-addressing). {1,64} enforces the RFC max length for the local part.

Examples

Input

john.doe

Matches

  • john.doe

Input

user+tag

Matches

  • user+tag

Input

has space

No match

—

Common use cases

  • •Validating partial email input as the user types
  • •Splitting and re-assembling email addresses
  • •Sub-address (plus-tag) handling in mail systems
  • •Form-by-form local-part-only collection
←PreviousLazy / Non-Greedy Quantifier
All patterns
NextSlug (Unicode Letters Allowed)→