Namespace: System.Text.RegularExpressions A regular expression is a set of characters that can be compared to a string to determine whether the string meets the specified format requirement. The static method System.Text.RegularExpressions. Regex.IsMatch is used to test a string against a specified regular expression. It’s a bit difficult to create regular expression It’s confusing to understand and modify a regular expression Creating Regular expressions : A simple regular expression can be “abc” that matches abc, abcdef, 123abcd, and all string that contain abc. To Specify that string must start with the expression use ‘^’ as “^abc” To Specify that the string must end with the specified expression use ‘$’ as “^abc$” Other characters that can be used in regular expressions are: ^ will match beginning of an input. In multi-line matches the beginning of each lin...
