Base Challenges

1. Write a regexp to match instances of "regex" in the text

    /regex/
   

2. With the same test string, write a regexp to match instances of "regex", "regexp", or "regular expression".

    /regex|regexp|regular expression/
   

3. Edit the regexp you just wrote to make sure it's case-insensitive (i.e. it should match "Regular Expression" as well as "regular expression").

    /regex|regexp|regular expression/i
   

Stretch Challenges

1. Again using the same text, write a regexp to match the HTML tags: (<p></p> and <span></span>).

    /<[a-z]+>|<\/[a-z]+>/
   

2. Write a regexp to validate a phone number.

    /\A\d{3}(\s|-)\d{3}-\d{4}\z/
   

3. Write a regexp to validate an email address.

    /[a-zA-Z0-9]+@[a-z]+.[a-z]+{2,}\z/