We know that regular expression is just string pattern or simple string that describes the sequence of characters for searching something in the specified string. The test() method of any regular expression object returns the Boolean value that indicates whether or not the searched pattern exists in specified string.
A twin prime is a prime number that differs from another prime number by two, for example the twin prime pair (41, 43) or (5,7). Simply means if N is the prime number and N+2 is also prime number then we can say that N and N+2 are the twin prime numbers.
The following code snippet demonstrate how to use regx class to find out whether the specified string is found in a given text or not. From the given code you can search the string into string.
You can use the Regex.Replace method to replace one date format to another date format in the entire string. The following code example uses the Regex.Replace method to replace dates that have the form mm/dd/yy with dates that have the form dd-mm-yy.
You can remove the set of the characters with the help of String.Remove method, but sometime this approach is not preferable by the developers, instead they use the regular expression for it. You can use the Regex.Replace method to strip some characters from the specified string.
The following code example demonstrates how we can extract the all numbers from the specified text.
The Following example shows how to split single string into array of the strings with the help of Regular expression in .net. We can split an input string into an array of substrings at the positions defined by a regular expression match.
Following example show that how we can validate password with the help of Regular Expression that have following validation in vb.net and c# languages :