Icu Match

:::info[Note] This is a point-in-time snapshot of the API documentation from January 2026. Going forward, we will not be maintaining a public copy of these references, and recommend users to refer to the built-in signature helpers available in the Hack LSP instead for complete and up-to-date information. :::

function icu_match(
  string $pattern,
  string $subject,
  int $flags = 0,
): mixed;

Parameters

• string $pattern
• string $subject
• int $flags = 0

Returns

• mixed