Common Patterns

• \d – Any digit (0-9)
• \w – Any word character (a-z, A-Z, 0-9, _)
• \s – Any whitespace character
• . – Any character except newline
• [abc] – Any character in the set (a, b, or c)
• [^abc] – Any character not in the set
• ^ – Start of string
• $ – End of string
• * – 0 or more repetitions
• + – 1 or more repetitions
• ? – 0 or 1 repetition
• {n} – Exactly n repetitions
• {n,} – n or more repetitions
• {n,m} – Between n and m repetitions
• (a|b) – a or b
• \b – Word boundary