HH\Lib\Regex\replace_with

Requires the Hack Standard Library to be installed.

Returns $haystack with any substring matching $pattern replaced by the result of $replace_func applied to that match

namespace HH\Lib\Regex;

function replace_with<T as HH\Lib\Regex\Match>(
  string $haystack,
    Pattern<T> $pattern,
  (function(T):string) $replace_func,
  int $offset = 0,
): string;

If $offset is given, replacements are made only starting from $offset.

Throws Invariant[Violation]Exception if $offset is not within plus/minus the length of $haystack.

Parameters

  • string $haystack
  • Pattern<T> $pattern
  • (function(T):string) $replace_func
  • int $offset = 0