Through a list of examples , we will build a script to validate phone numbers , UK postal codes, along with more examples.First, let’s start by building the webpage and the validation code then we will talk about the regular expressions used to validate the strings.
In the first line, I am using Element By Id() to grab the phone number from the input element.For more than 100 detailed regular expression recipes that include equal coverage for eight programming languages (C#, Java, Java Script, Perl, PHP, Python, Ruby, and VB. We’ll explain more about the question mark after discussing the other types of tokens in this regular expression.NET), get your very own copy of , so that your phone number records are consistent. The parentheses that appear without backslashes are capturing groups and are used to remember the values matched within them so that the matched text can be recalled later.A regular expression can easily check whether a user entered something that looks like a valid phone number. In this case, backreferences to the captured values are used in the replacement text so we can easily reformat the phone number as needed.By using capturing groups to remember each set of digits, the same regular expression can be used to replace the subject text with precisely the format you want. Two other types of tokens used in this regular expression are character classes and quantifiers.