Regex Basic Syntax

Basic Matchers

The characters in a regex pattern are called literals. They match themselves.

For example, the regex pattern hello matches the string hello.

Dot (.)

The dot . matches any character except a newline.

For example, the regex pattern h.t matches hat, hot, and hit.

Character Sets [abc]

A character set matches any one of the characters inside the square brackets.

For example, the regex pattern h[aeiou]t matches hat and hit.

Negated Character Sets [^abc]

A negated character set matches any character that is not inside the square brackets.

For example, the regex pattern h[^aeio]t matches hut and hxt.

Letter Range [a-z]

A letter range matches any one of the characters in the specified range.

For example, the regex pattern [a-z] matches any lowercase letter.

Number Range [0-9]

A number range matches any one of the numbers in the specified range.

For example, the regex pattern [0-9] matches any digit.