YouTipRegex Basics
\d # digit
\w # word character
\s # whitespace
. # any character
* # 0 or more
+ # 1 or more
? # 0 or 1
{n} # exactly nExamples
/^\d{3}-\d{4}$/ # phone: 123-4567
/[\w.+-]+@[\w.-]+/ # email
/https?:\/\/[^\s]+/ # URLSummary
- \d, \w, \s are the most common character classes
- Quantifiers control repetition