Regular Expression Preview Tool

Usage Instructions

• Use ^ and $ to match the beginning and end of a string
• Use \d to match digits, \w to match alphanumeric and underscore, \s to match whitespace
• Use + for one or more, * for zero or more, ? for zero or one
• Use () to create capture groups, view matched content in results
• Use [] to create character classes, match any character within
• Use {} to specify repetition count, e.g., {3} for 3 times, {3,5} for 3 to 5 times
• Use | for OR relationship, e.g., a|b matches a or b
• Use \ to escape special characters, e.g., \. matches dot itself
• g flag for global match, i flag for case insensitive
• m flag for multiline mode, s flag to make dot match newlines