Detailed explanation of the use of case-insensitive i modifier

This time I will bring you a detailed explanation of the use of the case-insensitive i modifier. What are the precautions when using the case-insensitive i modifier? Here are practical cases, let’s take a look.

Regular expressioni modifier:

The i modifier is used to specify that regular expression matching is case-insensitive.

Syntax structure:

Constructor functionMethod:

new RegExp("regexp","i" )

Object direct quantity method:

/regexp/i

Browser support:

IE browser supports this metacharacter.
Firefox supports this metacharacter.
Google Chrome supports this metacharacter.

Example code:

var str="This is an antzone good"; 
var reg=/this/;
console.log(str.match(reg));

The above code cannot match anything because it is case-sensitive.

var str="This is an antzone good"; 
var reg=/this/i;
console.log(str.match(reg))

The above code can successfully match because it is case-insensitive.

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

Recommended reading:

Detailed explanation of the use of u modifier in regular expressions (with code)

In regular expressions What are the new features in

The above is the detailed content of Detailed explanation of the use of case-insensitive i modifier. For more information, please follow other related articles on the PHP Chinese website!