Regular expressions

regex

It is a powerful way of searching and replacing something inside a string. To implement that we can use RegExp class and integrated with strings.

In Regular expressions we need pattern and optional flags.

So we have 2 ways –


var regexp = new RegExp("pattern", "flags");

var regexp = /pattern/g; // g is flag it's opptional

How to use


let str = "I am working on JavaScript!"; // will search here

let regexp = /working/;
console.info( str.search(regexp) ); // 2

Flags

we can use –

i – For case-insensitive

g – For all matches

m – For Multiline mode

u – For Enables full unicode support

y – For Sticky mode

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