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Development Tools Introduction to Regular Expressions Regular Expressions Excluding Characters

karan Badhwar
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karan Badhwar
Web Development Techdegree Graduate 18,135 Points
Posted by karan Badhwar
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karan Badhwar
Web Development Techdegree Graduate 18,135 Points

* V/s +

If I put

[^@.]* vs [^@.]+

Why the result is different?

I request can somebody please help this topic took more than 7 hours of my day I am re-watching video trying to to find something but cannot understand. How * and + works, How they are concatenating the strings after @ and before @

1 Answer

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,423 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,423 Points

Looking at the base [^@.] means

  • [ start of group
  • ^ negate listing
  • @ the character
  • . the character (not the wildcard character)
  • ] end of group

So, looking for any single character that is not an @ sign or a period .

Now adding the final + means one or more characters that meets the previous description.

Now adding the final * means zero or more characters that meets the previous description.

Post back if you need more help. Good luck!!!