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RegExp ​

Regular expression support. Patterns compile to native regex matching.

Creating Patterns ​

typescript
const re = /hello/i;                    // regex literal
const re2 = new RegExp("hello", "i");   // constructor

Supported flags: i (case-insensitive), m (multiline).

Methods ​

re.test(str) ​

Test if the pattern matches a string.

typescript
const re = /^hello/i;
re.test("Hello World");    // true
re.test("World Hello");    // false

re.exec(str) ​

Execute a match and return capture groups.

typescript
const re = /(\w+)@(\w+)/;
const match = re.exec("user@host");
// ["user@host", "user", "host"]

Returns null if no match.

str.match(re) ​

Match a string against a pattern (called on the string).

typescript
const result = "hello world".match(/(\w+)/);
// ["hello", "hello"]

Returns null if no match.

Example ​

typescript
const emailPattern = /[a-zA-Z0-9]+@[a-zA-Z0-9]+/;
const input = "contact: user@example.com";

if (emailPattern.test(input)) {
  console.log("contains email");
}