JavaScript / ECMAScript

Python Import Statement in JS

Match Python `import x` and `from x import y` statements, capturing the module and target.

Try it in the JS tester →

Pattern

regexJS
^(?:from\s+([\w.]+)\s+)?import\s+([\w.,\s\*]+?)(?:\s+as\s+\w+)?$   (flags: m)

JavaScript / ECMAScript code

jsJavaScript
const re = new RegExp("^(?:from\\s+([\\w.]+)\\s+)?import\\s+([\\w.,\\s\\*]+?)(?:\\s+as\\s+\\w+)?$", "m");
const input = "import os\\nfrom collections import defaultdict";
const matches = [...input.matchAll(re)];
console.log(matches.map(m => m[0]));

Uses `String.prototype.matchAll` for global iteration (Node 12+ / all modern browsers).

How the pattern works

(?:from\s+([\w.]+)\s+)? optionally matches `from <module>` and captures the module path (group 1). import\s+ requires the import keyword. ([\w.,\s\*]+?) captures the imported names (lazy so the optional `as` alias doesn't get sucked in). (?:\s+as\s+\w+)? optionally matches an alias. The m flag lets ^/$ anchor per line in a multi-line file.

Examples

Input

import os\nfrom collections import defaultdict

Matches

  • import os
  • from collections import defaultdict

Input

from typing import List, Dict, Optional

Matches

  • from typing import List, Dict, Optional

Input

// not python

No match

—

Same pattern, other engines

Python (re)

Supported

See how this pattern looks (and behaves) in Python's stdlib `re` module.

Go (RE2)

Supported

See how this pattern looks (and behaves) in Go's `regexp` package (RE2 engine).

← Back to Python Import Statement overview (all engines)