JavaScript RegExp i Modifier
Do a case-insensitive serch for "is":
let text = "Visit W3Schools";
let pattern = /w3schools/i;
let result = text.match(pattern);
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Definition and Usage
The "i" modifier specifies a case-insenitive match.
Browser Support
/regexp/i 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 |
Syntax
new RegExp("regexp", "i")
or simply:
/regexp/i
More Examples
Do a case-insensitive search for "w3schools" in a string:
Using the RegExp function exec()::
let text = "Visit W3Schools";
let pattern = /w3schools/i;
let result = pattern.exec(text);
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Using the RegExp function test()::
let text = "Visit W3Schools";
let pattern = /w3schools/i;
let result = pattern.test(text);
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Using the String function match():
let text = "Visit W3Schools";
let pattern = /w3schools/i;
let result = text.match(pattern);
Try it Yourself »
Tip
You can use the ignoreCase property to check if the "i" modifier is set.
Regular Expression Search Methods
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() |
