Regex cheat sheet

Special characters

• \ = Indicates that the following character should be treated specially, or "escaped"
• ^ = Batches the beginning of input
• $ = Batches the end of input
• x* = Batches the preceding item "x" 0 or more times
• x+ = Batches the preceding item "x" 1 or more times. Equivalent to {1,}
• x? = Batches the preceding item "x" 0 or 1 times

Character classes

• \w = Batches any alphanumeric character from the basic Latin alphabet, including the underscore. Equivalent to [A-Za-z0-9_]
• \W = Batches any character that is not a word character from the basic Latin alphabet. Equivalent to [^A-Za-z0-9_]
• \d = Batches any digit (Arabic numeral). Equivalent to [0-9]
• \D = Batches any character that is not a digit (Arabic numeral). Equivalent to [^0-9]
• \s = Batches a single white space character, including space, tab, form feed, line feed, and other Unicode spaces
• \S = Batches a single character other than white space.