Loading lessons...
RegExp Patterns
RegExp Patterns
Regex patterns have special characters that match types of text.
Character classes
| Pattern | Matches |
|---|---|
\d | any digit |
\w | word character (letters, digits, underscore) |
\s | whitespace (space, tab, newline) |
. | any single character |
/\d/.test("abc123"); // true (has a digit)
/\d/.test("abc"); // falseQuantifiers
| Pattern | Meaning |
|---|---|
* | zero or more |
+ | one or more |
? | zero or one |
{n} | exactly n |
{n,m} | between n and m |
/a+/.test("caa"); // trueAnchors
| Pattern | Meaning |
|---|---|
^ | start of text |
$ | end of text |
/^hello$/.test("hello"); // true
/^hello$/.test("say hello"); // falseBrackets
[abc] matches a, b, or c. [0-9] matches any digit.
TL;DR
- \d digits, \w word chars, \s whitespace.
- * + ? {n,m} control how many.
- ^ and $ anchor to start and end.
- [abc] matches one of the listed chars.