GraphQL Operation Header in PY
Match GraphQL operation headers — `query`, `mutation`, or `subscription` — capturing the operation name.
Try it in the PY tester →Pattern
regexPY
(query|mutation|subscription)\s+(\w+)?\s*(?:\([^)]*\))?\s*\{ (flags: g)Python (re) code
pyPython
import re
pattern = re.compile(r"(query|mutation|subscription)\s+(\w+)?\s*(?:\([^)]*\))?\s*\{")
input_text = "query GetUser($id: ID!) { user(id: $id) { name } }"
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
(query|mutation|subscription) captures the operation type. \s+(\w+)? optionally captures the operation name (anonymous operations omit it). (?:\([^)]*\))? optionally matches a variables declaration `($var: Type)`. The trailing `\s*\{` matches the opening brace of the selection set.
Examples
Input
query GetUser($id: ID!) { user(id: $id) { name } }Matches
query GetUser($id: ID!) {
Input
mutation { createPost(title: "hi") { id } }Matches
mutation {
Input
// not graphqlNo match
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