Regular expression for validating url in c
If the pattern will match the inputted URL in the textbox then it will display Valid URL! because this regular expression is the pattern for validating URL. Because of this one may be tempted to simply copy the best regex you can find (gist).
Grouping constructs include the language elements listed in the following table. Back to top A quantifier specifies how many instances of the previous element (which can be a character, a group, or a character class) must be present in the input string for a match to occur.These constructs include the language elements listed in the following table. Back to top Substitutions are regular expression language elements that are supported in replacement patterns. The metacharacters listed in the following table are atomic zero-width assertions.Back to top You can specify options that control how the regular expression engine interprets a regular expression pattern.If the program code does not match the Regular Expression then the compiler indicates that there is a syntax error. When a user clicks the OK button, the program checks to ensure that none of the fields are empty.If one or more fields are empty then the program displays a message to the user that all fields must be filled in before the program can validate the input information.
If the value of Success is false (i.e., there was no match) then display an error message and set the focus back to the first Name Text Box so that the user can retype the input and terminate the event handler.