JS regular ignore case

js When writing a regular , By default, regular is case sensitive .

for example ：

var str = 'HelloWorld';
var reg = /h/g;
reg.test(str); // return false

We can use i To ignore case , The grammar is as follows ：

/regex/i

The above code is modified as follows ：

var str = 'HelloWorld';
var reg = /h/gi;
reg.test(str); // return true

following , Let's use the regular modifier i, It's solved js Regular ignore case .

Regular in real projects , Although not used very much , But master the regularity , At the critical moment , But you can get twice the result with half the effort , Common implementations are as follows ： Replace string 、 obtain url Parameters, etc. .