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C # tutorial
Do a global search for the numbers 1, 2, 3 and 4 in a string
/[0-9]/ 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 |
Use the [^0-9] expression to find any character that is NOT a digit.
Do a global search for the number "1" in a string:
let text = "12121212";
let pattern = /[1]/g;
In JavaScript, a regular expression text search, can be done with different methods.
With a pattern as a regular expression, these are the most common methods:
| Example | Description |
|---|---|
| text.match(pattern) | The String method match() |
| text.search(pattern) | The String method search() |
| pattern.exec(text) | The RexExp method exec() |
| pattern.test(text) | The RegExp method test() |