Learn Regex Flags – Global, Case-Insensitive, Multiline & More Explained | Regex Tutorial
Want to learn regex flags the right way? This tutorial covers all essential regex flags like g, i, m, s, u, y, and JavaScript-specific d — explained with clear examples and live demos on regex101 and in JavaScript.
🔍 What You’ll Learn in This Video:
What regex flags are and how they change matching behavior
How to use g, i, m, s, u, y, and d in real code
Flag usage in JavaScript, Python, and online tools like regex101
How regex behaves differently with and without flags
Real-world examples and live regex testing walkthroughs
💡 Ideal for beginners and developers looking to master regular expressions step by step. Whether you're writing scripts, cleaning data, or coding in JavaScript/Python, this episode gives you the essential flag knowledge you need.
📺 Part of the Full Playlist: • Learn Regex from Scratch – Full Beginner t...
00:00 Introduction
00:07 Proper regex writing convention
00:30 Regular expression flags
01:10 Regex writing convention
02:47 Using regular expressions in JavaScript, Python or PHP
04:12 Global (g) flag
04:49 Global (g) flag demo in regex101
05:35 Global (g) flag usage in JavaScript
06:05 Indices (d) flag - JavaScript specific
06:31 Indices (d) flag usage in JavaScript
07:11 Ignore case (i) flag
07:34 Ignore case (i) flag demo in regex101
08:18 Single line/Dot all (s) flag
08:57 Single line/Dot all (s) flag demo in regex101
09:50 Multiline (m) flag
11:35 Multiline (m) flag demo in regex101
13:54 Unicode (u and v) flags
15:50 Unicode (u and v) flags demo in regex101
17:28 Sticky (y) flag - JavaScript specific
18:13 Sticky (y) flag demo in JavaScript
20:51 Conclusion
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