regex.md

Regex Patterns

• . - Any Character Except New Line

• \d - Digit (0-9)

• \D - Not a Digit (0-9)

• \w - Word Character (a-z, A-Z, 0-9, _)

• \W - Not a Word Character

• \s - Whitespace (space, tab, newline)

• \S - Not Whitespace (space, tab, newline)

• \b - Word Boundary

• \B - Not a Word Boundary

• ^ - Beginning of a String

• $ - End of a String

• [] - Matches Characters in brackets

• [^ ] - Matches Characters NOT in brackets

• | - Either Or

• ( ) - Group

Quantifiers:

• *(asterisk) - 0 or More
• +(plus) - 1 or More
• ? - 0 or One
• {3} - Exact Number
• {3,4} - Range of Numbers (Minimum, Maximum)

Sample Regexs

[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+.[a-zA-Z0-9-.]+