Regex : Installing an engine.mp4

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What is Regex?

Regex (Regular Expression) is a powerful pattern-matching tool used to search, validate, extract, and manipulate text.
It is widely used in programming languages like PHP, Python, JavaScript, Java, and in tools like Linux grep, editors, and databases.

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🔧 Installing a Regex Engine

The good news is:

👉 You usually don’t need to install a separate Regex engine.
Most programming languages already include a built-in Regex engine.

However, depending on your environment, here’s how it works:

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1️⃣ In PHP (PCRE Engine)

PHP uses PCRE (Perl Compatible Regular Expressions) by default.

✅ No Installation Required

Regex works automatically in PHP.

Example:

<?php
$text = "Hello123";
if (preg_match("/[0-9]+/", $text)) {
    echo "Number found!";
}
?>

Functions:

• preg_match()

• preg_replace()

• preg_split()

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2️⃣ In Python

Python includes the built-in re module.

✅ No Installation Required

Example:

import re

text = "Hello123"
match = re.search(r"\d+", text)

if match:
    print("Number found!")

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3️⃣ In JavaScript

JavaScript has built-in Regex support.

✅ No Installation Required

Example:

let text = "Hello123";
let result = /\d+/.test(text);

if (result) {
  console.log("Number found!");
}

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4️⃣ Installing a Standalone Regex Engine (Optional)

If you're working in:

• C / C++

• Custom software

• Embedded systems

You may install external engines like:

• PCRE library

• RE2 (Google Regex engine)

• On Linux: sudo apt install libpcre3

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🚀 Summary

Language	Installation Needed?
PHP	❌ No
Python	❌ No
JavaScript	❌ No
Java	❌ No
C/C++	✅ Sometimes

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💡 Important Tip

Regex is not a software you install like MySQL or Node.js.
It is a text pattern engine built into programming languages.

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