Remove parentheses, dashes, and spaces from phone number

Question

I have a phone number like (123) 456-7890. I am using the replaceAll method to remove () and - and spaces from the string. I tried following

String phNo= "(123) 456-7890".replaceAll("[()-\\s]").trim();

but it's not working. Any solution?

Answer 1

This should work:

String phNo = "(123) 456-7890".replaceAll("[()\\s-]+", "");

In your regex:

• \s should be \\s
• Hyphen should be first or last in character class to avoid escaping or use it as \\-
• Use quantifier + as in [()\\s-]+ to increase efficiency by minimizing # of replacements

Answer 2

If you are using Kotlin than

mobileNo.replace(Regex("[()\\-\\s]"), "")