RegExp /i Flag
Do a case-insensitive serch for "is":
let text = "Visit W3Schools";
let pattern = /w3schools/i;
let result = text.match(pattern);
Try it Yourself »
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);
Try it Yourself »
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 Methods
Regular Expression Search and Replace can be done with different methods.
These are the most common:
String Methods
| Method | Description |
|---|---|
| match(regex) | Returns an Array of results |
| matchAll(regex) | Returns an Iterator of results |
| replace(regex) | Returns a new String |
| replaceAll(regex) | Returns a new String |
| search(regex) | Returns the index of the first match |
| split(regex) | Returns an Array of results |
RegExp Methods
| Method | Description |
|---|---|
| regex.exec() | Returns an Iterator of results |
| regex.test() | Returns 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 |
