I need help understanding this Regex?

I need help understanding this Regex?
0

#1

I’m in the JavaScript Lesson “Specify Upper and Lower Number of Matches” and I am kindof confused by the correct answer:

let ohStr = "Ohhh no";
let ohRegex = /oh{3,6}\sno/i; // Change this line
let result = ohRegex.test(ohStr);

This is my understanding & confusion:
-The first segment “oh” checks the string starts with “oh” characters. Why doesn’t it work if you use “h” instead?

-The second segment “{3,6}” searches for “h” character 3 to 6 times. Or is it checking for the “oh” 3 to 6 times? Or checking for “h” 3 to 6 times following an “o”?

-The third segment searches for whitespace.

-The fourth segment searches for “no” characters. Why is this part necessary?

-The fifth segment “/i” ignores case.


#2

Can you add a link to the exercise?


#3

https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/regular-expressions/specify-upper-and-lower-number-of-matches


#4
  1. Because it will only match its substring excluding o at the beginning.
  2. searches h character 3 to 6 times.
  3. Without it, it will only match "h"s.

#5

Okay, thank you! I’m finding it difficult to follow the regex logic in these lessons, but hopefully with practice it will become clear.


#6

Regex is like a receipe. try using a Regex Tester and cheat sheet to understand what you are looking at.

https://www.regexpal.com/


#7

Excellent, thank you! I’ve been making notes as I go through the lessons but this looks much simpler to look at for fast reference.