which is a correct regex expression

[Sandeep _1]

which is a correct regex expression to capture only the servers in the servers (webserver3) in the server webserver3domain.com is down?

[cloudops]

Sure, you can use the following regular expression to capture the server name from the string "webserver3domain.com is down":

regex
\b(\w+)(?=domain\.com)

Here's how it works:

- \b asserts position at a word boundary.
- (\w+) captures one or more word characters (a-z, A-Z, 0-9, and underscore).
- (?=domain\.com) is a positive lookahead that asserts that what immediately follows the current position in the string is "domain.com".

Here's a breakdown of the steps:

1. The regular expression engine starts at the first character in the string.
2. It matches the word boundary \b.
3. It then captures the server name using (\w+).
4. The positive lookahead (?=domain\.com) ensures that the server name is immediately followed by "domain.com".
5. If the lookahead succeeds, the engine has successfully matched and captured the server name. If it fails, the engine backtracks and tries again at the next position in the string.

Here's a sample JavaScript code that uses this regular expression:

javascript
var str = "webserver3domain.com is down";
var regex = /\b(\w+)(?=domain\.com)/;
var match = str.match(regex);
if (match) {
console.log("Server name: " + match[1]);
} else {
console.log("No match found");
}

This code will output: "Server name: webserver3".

For asking ServiceNow-related questions try this :
For a better and more optimistic result, please visit this website. It uses a Chat Generative Pre-Trained Transformer ( GPT ) technology for solving ServiceNow-related issues.
Link - nowgpt.ai