Regular expression in java for validating numbers
Regular expressions are a good way to validate text fields such as names, addresses, phone numbers, and other user information. A regular expression can easily check whether a user entered something that looks like a valid phone number.
This content is outdated and is no longer being maintained.If the number is valid then alert message will be displayed as ‘Phone number is valid’. If the number is invalid, alert message will be displayed as ‘Phone number is not valid. The second main use of regular expressions is for search and replace operations.If you are running a chat group where users can enter data, for example, you might want to check the input for swear words and replace them with blanks.