RegExp.prototype.flags

The flags accessor property of {{jsxref("RegExp")}}  instances returns the flags of this regular expression.

{{InteractiveExample("JavaScript Demo: RegExp.prototype.flags")}} 

// Outputs RegExp flags in alphabetical order

console.log(/foo/gi.flags);
// Expected output: "gi"

console.log(/^bar/muy.flags);
// Expected output: "muy"

Description

RegExp.prototype.flags has a string as its value. Flags in the flags property are sorted alphabetically (from left to right, e.g., "dgimsuvy"). It actually invokes the other flag accessors (hasIndices, global, etc.) one-by-one and concatenates the results.

All built-in functions read the flags property instead of reading individual flag accessors.

The set accessor of flags is undefined. You cannot change this property directly.

Examples

Using flags

/foo/ig.flags; // "gi"
/^bar/myu.flags; // "muy"

Specifications

{{Specifications}} 

Browser compatibility

{{Compat}} 

See also

• Polyfill of RegExp.prototype.flags in core-js
• es-shims polyfill of RegExp.prototype.flags
• Advanced searching with flags in the Regular expressions guide
• {{jsxref("RegExp.prototype.source")}}