Regular expressions (regex) are a powerful tool for pattern matching and searching in text. This quick guide will help you understand the basics of regex syntax and usage.
Basic Syntax
.matches any character except a newline*matches zero or more of the preceding element+matches one or more of the preceding element?matches zero or one of the preceding element[]defines a character class, matching any one of the characters listed^asserts the position at the start of a line$asserts the position at the end of a line
Examples
a.*bmatches any string that contains "a" followed by any characters and ends with "b"[a-z]matches any lowercase letter^Hellomatches any string that starts with "Hello"
Resources
For more detailed information and examples, check out our comprehensive guide on Regular Expressions.