JavaScript RegExp ? Quantifier

Do a global search for a "1", followed by zero or one "0" characters:

let text = "1, 100 or 1000?";
let pattern = /10?/g;

Description

The n? quantifier matches any string that contains zero or one occurrences of n.

/n?/ is an ECMAScript1 (ES1) feature.

ES1 (JavaScript 1997) is fully supported in all browsers:


Chrome	Edge	Firefox	Safari	Opera	IE
Yes	Yes	Yes	Yes	Yes	Yes

new RegExp(" n?")

or simply:

/ n?/

new RegExp(" n?", "g")

or simply:

/ n?/g