MIME Type in PY
Validate MIME media type strings like text/html, application/json, or image/png; charset=utf-8.
Try it in the PY tester →Pattern
regexPY
^([a-z]+)\/([a-z0-9][a-z0-9!#$&\-^_.]*)(?:;\s*[a-z]+=\S+)*$ (flags: i)Python (re) code
pyPython
import re
pattern = re.compile(r"^([a-z]+)\/([a-z0-9][a-z0-9!#$&\-^_.]*)(?:;\s*[a-z]+=\S+)*$", re.IGNORECASE)
input_text = "application/json"
for m in pattern.finditer(input_text):
print(m.group(0))Stdlib `re` module — no third-party dependency. Works on Python 3.6+.
How the pattern 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/jsonMatches
application/json
Input
text/html; charset=utf-8Matches
text/html; charset=utf-8
Input
not a mime typeNo match
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