All you need to do is to enter an IP address and click the "Validate" button. In order to help your programming or testing tasks, has designed this online tool for you to validate any given domain name. In order to help your programming or testing tasks, has designed this online tool for you to validate any given email address using PHP regular expressions. has prepared a number of data Encoders and Decoders for you: Binary to Hex Encoder Hex to Binary Decoder Base64 Encoder Base64 Decoder UUEncode (Unix-to-Unix Encode) UUDecode (Unix-to-Unix Decode) URL String Encoder URL String Decoder HTML Enti...
Validation result will be displayed in the result area. All you need to do is to enter a domain name and click the "Validate" button. All you need to do is to enter an email address and click the "Validate" button.
Regular expressions can be tricky depending on what you're trying to achieve - you can check out this cheat sheet to review some of the basics.
From there, you can validate user input in a variety of different ways: Choose between several standard formats to validate your Textbox field: These formats are already set up and don't require any calculations whatsoever; just select your format and you're good to go.
Validation result will be displayed in the result area. A MAC address is a unique identifier assigned to most network adapters or network interface cards (NICs) by the manufacturer for identification, IEEE 802 standards use 48 bites or 6 bytes to represent a MAC address.
This format gives 281,474,976,710,656 possible unique MAC addresses.
Then, write a custom error message: When users don't input their answers correctly, your error message will appear: When you want to validate user input beyond just a sequence of numbers and letters, regular expressions allow you to validate or reformat very specific strings of text.
For example; if you wanted a user to input a Hex color code (typically formatted as a "#" followed by 6 numbers or letters from A-F), you could use the following regular expression: After you include an error message, the user will encounter an error if their code is not formatted correctly: You also have the ability to reformat a regular expression by adjusting spaces, adding dashes, switching around groups, etc.