JavaScript RegExp ? Quantifier
Example
Do a global search for a "1", followed by zero or one "0" characters:
let text = "1, 100 or 1000?";
let pattern = /10?/g;
Try it Yourself »
Definition and Usage
The n? quantifier matches any string that contains zero or one occurrences of n.
Browser Support
/n?/ is an ECMAScript1 (ES1) feature.
ES1 (JavaScript 1997) is fully supported in all browsers:
| Chrome | IE | Edge | Firefox | Safari | Opera |
| Yes | Yes | Yes | Yes | Yes | Yes |
Syntax
new RegExp("n?")
or simply:
/n?/
Syntax with modifiers
new RegExp("n?", "g")
or simply:
/n?/g
