Using regular expressions in Node.js is quite straightforward and similar to how it’s done in Javascript.
To create a regular expression in Node.js, you can use the `RegExp` object or simply use the regular expression literal, which consists of a pattern enclosed between slashes.
Here is how you can do it:
1. Creating Regular Expression Using Literal
```
let regex = /world/; // This will match the string “world” in any content.
```
1. Creating Regular Expression Using RegExp Object
```
let regex = new RegExp(‘world’); // This will match the string “world” in any content.
```
Now if you want to check if a string matches the regular expression or not:
```
let content = “Hello world”;
if(regex.test(content)) {
console.log(“Match found”);
} else {
console.log(“Match not found”);
}
```
You can also find a match in a string:
```
console.log(content.match(regex)); // this will return an array of results
```
Or replace a matching string:
```
let newContent = content.replace(regex, “everyone”); // replaces “world” with “everyone“
console.log(newContent); // Output: “Hello everyone“
```
Note: If you want to search globally (find all matches rather than stopping after the first match), you can use the g flag, and if you want the search to be case-insensitive, you can use the i flag.
Example:
```
let regex = /world/gi; // will match all occurrences of “world”, case-insensitive
```
