RegExp /i Flag
Do a case-insensitive serch for "is":
let text = "Visit W3Schools";
let pattern = /w3schools/i;
let result = text.match(pattern);
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Description
The /i (insensitive) flag makes the regular expression perform a case-insensitive search.
With the /i flag set, "W3Schools" will match "w3schools".
Syntax
new RegExp("regexp", "i")
or simply:
/regexp/i
See Also:
The Corresponding Property: ignoreCase
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 flag 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:
String Methods
| match(pattern) | An Array of results |
| matchAll(pattern) | An Iterator of results |
| replace(pattern, rep) | A new String |
| search(pattern) | Index of the first match |
| split(pattern) | An Array of results |
RegExp Methods
| pattern.exec() | An Iterator of results |
| pattern.test() | true or false |
Browser Support
/regexp/i is an ECMAScript1 (JavaScript 1997) feature.
It is supported in all browsers:
| Chrome | Edge | Firefox | Safari | Opera | IE |
| Yes | Yes | Yes | Yes | Yes | Yes |
