w3resource

JavaScript ignoreCase Property: RegExp Object

Description

The ignoreCase property of the RegExp object is a flag which indicates whether the case is to be ignored during pattern matching in a string. The value of ignoreCase is true if the 'i' flag was used; otherwise, false.

Version

Implemented in JavaScript 1.2

Syntax

RegExp.ignoreCase

Example:

The following web document demonstrates how the ignoreCase property can be used.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
<title>JavaScript Regexp ignoreCase Property : Example-1</title>
</head>
<body>
<h1 style="color: red">JavaScript Regexp ignoreCase Property</h1>
<hr />
<script type="text/javascript">
//This is done to make the following JavaScript code compatible to XHTML. <![CDATA[
// A regular expression on the pattern “The”
strpat1 = new RegExp("the","i");
// Declare a string.
str1 = "The Quick Brown Fox Jumps Over The Lazy Dog";
// Executes search for pattern match with exec() and store result in an array array1,array2.
array1 = strpat1.exec(str1);
document.write("The value of RegExp.ignoreCase (for 'the' pattern) is: " + strpat1.ignoreCase);
//]]>
</script>
</body>
</html>

View the example in the browser

Supported Browser

Internet Explorer 7 Firefox 3.6 Google Chrome 7 Safari 5.0.1 Opera 10
Yes Yes Yes Yes Yes

See also:

JavaScript Core objects, methods, properties.

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Next: JavaScript lastIndex Property: RegExp Object



JavaScript: Tips of the Day

Returns all unique values of an array, based on a provided comparator function

Example:

const tips_uniqueElementsBy = (arr, fn) =>
  arr.reduce((acc, v) => {
    if (!acc.some(x => fn(v, x))) acc.push(v);
    return acc;
  }, []);

console.log(tips_uniqueElementsBy(
  [
    { id: 0, value: 'p' },
    { id: 1, value: 'q' },
    { id: 2, value: 'r' },
    { id: 1, value: 's' },
    { id: 0, value: 't' }
  ],
  (a, b) => a.id == b.id
)); 

Output:

[[object Object] {
  id: 0,
  value: "p"
}, [object Object] {
  id: 1,
  value: "q"
}, [object Object] {
  id: 2,
  value: "r"
}]