Regex to check string contains only Hex characters
The problem arises because the numbers 0-9 are also decimal values. PART of what you have to do is to test for 00-99 instead of just 0-9 to ensure that the lower values are not decimal numbers.
How to validate MAC address using Regular Expression
Jul 15, 2025 · [0-9a-fA-F] {4}\\. represents the second part of four hexadecimal digits separated by dots (.). [0-9a-fA-F] {4} represents the third part of four hexadecimal digits.
regex101: Regex for MAC address
Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/.NET, Rust.
Sets and ranges [...] - The Modern JavaScript Tutorial
Oct 14, 2022 · Here [0-9A-F] has two ranges: it searches for a character that is either a digit from 0 to 9 or a letter from A to F. If we’d like to look for lowercase letters as well, we can add the range a-f: [0 …
How to Use Regex in Java to Check for Hexadecimal Characters ...
Learn how to use Java regex to verify if a string contains only hexadecimal characters (0-9, A-F). Step-by-step guide and code included.
Hexadecimal Number Regular Expression - Regex Pattern
Matches a character in the range “a” to “f”. Case insensitive. + Quantifier. Match 1 or more of the preceding token. A regular expression that matches hexadecimal values.
GUIDType Simple Type (Performance Counters) - Win32 apps
Jul 14, 2025 · Use GUIDGen.exe or UUIDGen.exe to create a GUID. Defines a globally unique identifier type, in Registry format.