✨ Earn college credits in Cybersecurity, JS, HTML, CSS and Python

🤑 Join the Treehouse affiliate program and earn 25% recurring commission!

New No-Code Track! 🚀start learning today!

🌟 Dreaming of a bright future? 🎓 Ask about the Treehouse Scholarship program! 🚀

✨ Earn college credits in Cybersecurity, JS, HTML, CSS and Python

🤑 Join the Treehouse affiliate program and earn 25% recurring commission!

  • Treehouse Logo
  • Plans
    Chevron
    • For Individuals
    • For Businesses
    • For Schools
    • For Libraries
    • For Military
  • Library
    Chevron
    • All Courses
    • Tracks
    • College Credit
  • Techdegree
    Chevron
    • Overview
    • Front End Development
    • Full Stack JavaScript
    • Data Analysis
    • UX Design
    • Python
  • Community
    Chevron
    • Code Adventures
    • Discord
    • Forum
    • Success Stories
    • Treehouse Links
    • 100 Days of Code
  • Resources
    Chevron
    • Career Toolbox
    • CodeForward
    • Free Treehouse Near Me
    • Jobs
    • Blog
    • Support
    • About
  • For Individuals For Businesses For Schools For Libraries For Military
  • All Courses Tracks College Credit
  • Overview Front End Web Development Full Stack JavaScript Python Development Data Analysis UX Design
  • Code Adventures Discord Forum Success Stories Treehouse Links 100 Days of Code
  • Career Toolbox CodeForward Free Treehouse Near Me Jobs Blog Support About
  • Sign In
  • Free Trial
Instagram Twitter Facebook YouTube LinkedIn
    • Newest
      • Newest
      • Active
      • Unanswered
      • Featured
    • All Topics
      • All Topics
      • • General Discussion
      • • AI
      • • Android
      • • APIs
      • • Coding for Kids
      • • College Credit
      • • Computer Science
      • • CSS
      • • Data Analysis
      • • Databases
      • • Design
      • • Development Tools
      • • Digital Literacy
      • • Game Development
      • • Go Language
      • • HTML
      • • Java
      • • JavaScript
      • • Learning Resources
      • • Machine Learning
      • • No-Code
      • • PHP
      • • Professional Growth
      • • Python
      • • Quality Assurance
      • • React
      • • Ruby
      • • Security
      • • Swift
    • Showing results for:
    • JavaScript
    • Regular Expressions in JavaScript
    • Reformatting User Input
    • Close
  • Patrick Thomas
    seal-mask
    .a{fill-rule:evenodd;}techdegree
    Patrick Thomas
    Full Stack JavaScript Techdegree Student 3,529 Points

    Having a bit of trouble with this problem?

    Posted on Dec 21, 2022 by Patrick Thomas
    .a{fill-rule:evenodd;}techdegree
    Patrick Thomas
    Full Stack JavaScript Techdegree Student 3,529 Points
    • JavaScript
    • Regular Expressions in JavaScript
    • Reformatting User Input
    • Reformatting Text

    1 Answer

  • karan Badhwar
    seal-mask
    .a{fill-rule:evenodd;}techdegree seal-36
    karan Badhwar
    Web Development Techdegree Graduate 18,135 Points

    What will be scope of $1 (stored string in parentheses)

    Posted on Jan 16, 2022 by karan Badhwar
    .a{fill-rule:evenodd;}techdegree seal-36
    karan Badhwar
    Web Development Techdegree Graduate 18,135 Points
    • JavaScript
    • Regular Expressions in JavaScript
    • Reformatting User Input
    • Using Replace with Captured Groups

    1 Answer

  • karan Badhwar
    seal-mask
    .a{fill-rule:evenodd;}techdegree seal-36
    karan Badhwar
    Web Development Techdegree Graduate 18,135 Points

    How /(\d*)(\d{2})/ this works

    Posted on Jan 16, 2022 by karan Badhwar
    .a{fill-rule:evenodd;}techdegree seal-36
    karan Badhwar
    Web Development Techdegree Graduate 18,135 Points
    • JavaScript
    • Regular Expressions in JavaScript
    • Reformatting User Input
    • Using Replace with Captured Groups

    1 Answer

  • Mel Rojo
    seal-mask
    .a{fill-rule:evenodd;}techdegree
    Mel Rojo
    Full Stack JavaScript Techdegree Student 4,699 Points

    Not sure how to solve this challenge

    Posted on Aug 16, 2021 by Mel Rojo
    .a{fill-rule:evenodd;}techdegree
    Mel Rojo
    Full Stack JavaScript Techdegree Student 4,699 Points
    • JavaScript
    • Regular Expressions in JavaScript
    • Reformatting User Input
    • Reformatting Text

    3 Answers

  • Muaaz Matwadia
    seal-mask
    .a{fill-rule:evenodd;}techdegree seal-36
    Muaaz Matwadia
    Full Stack JavaScript Techdegree Graduate 19,327 Points

    Regex replace

    Posted on Apr 7, 2021 by Muaaz Matwadia
    .a{fill-rule:evenodd;}techdegree seal-36
    Muaaz Matwadia
    Full Stack JavaScript Techdegree Graduate 19,327 Points
    • JavaScript
    • Regular Expressions in JavaScript
    • Reformatting User Input
    • Reformatting Text

    1 Answer

  • Dan Warren
    Dan Warren
    9,125 Points

    Regular Expressions in JavaScript Coding Challenge

    Posted on Aug 5, 2020 by Dan Warren
    Dan Warren
    9,125 Points
    • JavaScript
    • Regular Expressions in JavaScript
    • Reformatting User Input
    • Reformatting Text

    0 Answers

  • Begana Choi
    PLUS
    Begana Choi
    Courses Plus Student 13,126 Points

    why do we use /(\d*)(\d{2})/ instead of /(\d{2})(\d{2})/ in this video?

    Posted on Feb 18, 2020 by Begana Choi
    Begana Choi
    Courses Plus Student 13,126 Points
    • JavaScript
    • Regular Expressions in JavaScript
    • Reformatting User Input
    • Using Replace with Captured Groups

    1 Answer

  • Haardik Gupta
    seal-mask
    .a{fill-rule:evenodd;}techdegree
    Haardik Gupta
    Full Stack JavaScript Techdegree Student 5,459 Points

    help replace

    Posted on Jan 16, 2020 by Haardik Gupta
    .a{fill-rule:evenodd;}techdegree
    Haardik Gupta
    Full Stack JavaScript Techdegree Student 5,459 Points
    • JavaScript
    • Regular Expressions in JavaScript
    • Reformatting User Input
    • Reformatting Text

    1 Answer

  • <noob />
    <noob />
    17,063 Points

    understanding the reguler expression deeper from the video

    Posted on Jan 7, 2020 by <noob />
    <noob />
    17,063 Points
    • JavaScript
    • Regular Expressions in JavaScript
    • Reformatting User Input
    • A Better Telephone Number Validator

    1 Answer

  • John Nguyen
    seal-mask
    .a{fill-rule:evenodd;}techdegree seal-36
    John Nguyen
    Full Stack JavaScript Techdegree Graduate 30,501 Points

    \D allows for non-digit characters, meaning a-z would be allowed.

    Posted on Dec 20, 2019 by John Nguyen
    .a{fill-rule:evenodd;}techdegree seal-36
    John Nguyen
    Full Stack JavaScript Techdegree Graduate 30,501 Points
    • JavaScript
    • Regular Expressions in JavaScript
    • Reformatting User Input
    • A Better Telephone Number Validator

    1 Answer

  • Lanai Lewis
    Lanai Lewis
    10,400 Points

    I agree with the previously asked question. The regex in the video does not work in regexPal or in app.js

    Posted on Apr 17, 2019 by Lanai Lewis
    Lanai Lewis
    10,400 Points
    • JavaScript
    • Regular Expressions in JavaScript
    • Reformatting User Input
    • A Better Telephone Number Validator

    3 Answers

  • David Aguirre
    David Aguirre
    8,170 Points

    The regex used in the video is not working in any regex site.

    Posted on Mar 17, 2019 by David Aguirre
    David Aguirre
    8,170 Points
    • JavaScript
    • Regular Expressions in JavaScript
    • Reformatting User Input
    • A Better Telephone Number Validator

    1 Answer

  • Shengyi Li
    Shengyi Li
    17,175 Points

    I use the preview get the right output. But system show wrong. I have no clue. const newText = '$2，$1';

    Posted on Sep 7, 2017 by Shengyi Li
    Shengyi Li
    17,175 Points
    • JavaScript
    • Regular Expressions in JavaScript
    • Reformatting User Input
    • Reformatting Text

    1 Answer

  • Brian Foley
    Brian Foley
    8,440 Points

    RegExp challenge question stuck

    Posted on Sep 2, 2017 by Brian Foley
    Brian Foley
    8,440 Points
    • JavaScript
    • Regular Expressions in JavaScript
    • Reformatting User Input
    • Reformatting Text

    5 Answers

  • Brian Foley
    Brian Foley
    8,440 Points

    reformatting won't reformat :(

    Posted on Sep 2, 2017 by Brian Foley
    Brian Foley
    8,440 Points
    • JavaScript
    • Regular Expressions in JavaScript
    • Reformatting User Input
    • Reformatting a Telephone Number

    1 Answer

Posting to the forum is only allowed for members with active accounts.
Please sign in or sign up to post.

    Treehouse

  • About
  • Blog
  • Careers
  • Community
  • Stories
  • Shop
  • Contact
  • Gift Card

See Full Catalogue

Techdegree

  • Front End Web Development
  • Full Stack JavaScript
  • Python Development
  • Data Analysis
  • UX Design

Tracks

  • Learn to Code for Beginners
  • Beginning Python
  • Beginning SQL
  • Beginning Java
  • ...see more

Courses

  • JavaScript Basics
  • Intro to HTML & CSS
  • Python Basics
  • CSS Layout
  • ...see more

Explore

  • Plans
  • Affiliates
  • Perks
  • Free Treehouse Near Me
  • Treehouse for Libraries
  • Treehouse for Businesses
  • Twitter
  • YouTube
  • Facebook
  • LinkedIn
  • Instagram
Terms & Conditions | Privacy

© 2025 Treehouse Island, Inc.