Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

JavaScript Regular Expressions in JavaScript Validating a Form Validating a Phone Number

Begana Choi
PLUS
Begana Choi
Courses Plus Student 13,124 Points

why do we use "\" for "(" and ")" but not for " - " ?

if I understood through this video, we use ( and ) to make a form of a telephone number. I guess ( and ) is normal syntax and that's why we need to use \ but why we don't use \ for - ? I'm a bit confused .

1 Answer

Steven Parker
Steven Parker
216,033 Points

Parentheses have special meaning in a pattern, they imply grouping. So the escape character "\" is used when you want a parenthesis to represent itself and not indicate a grouping.

But you don't need to escape hyphens ("-") because they don't have any special meaning to a pattern by themselves.