Validationflags: i

MIME Type

Validate MIME media type strings like text/html, application/json, or image/png; charset=utf-8.

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-z]+)\/([a-z0-9][a-z0-9!#$&\-^_.]*)(?:;\s*[a-z]+=\S+)*$   (flags: i)

Raw source: ^([a-z]+)\/([a-z0-9][a-z0-9!#$&\-^_.]*)(?:;\s*[a-z]+=\S+)*$

How it works

Group 1 captures the primary type (text, image, application, etc). Group 2 captures the subtype using the allowed MIME subtype character set. The optional trailing group (?:;\s*[a-z]+=\S+)* matches parameters like charset=utf-8 or boundary=something.

Examples

Input

application/json

Matches

  • application/json

Input

text/html; charset=utf-8

Matches

  • text/html; charset=utf-8

Input

not a mime type

No match

—

Common use cases

  • •Content-Type header validation in API middleware
  • •File upload MIME type enforcement
  • •HTTP response content negotiation
  • •OpenAPI spec validation tooling
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