Add regexReplace function

[aleclarson]

• It's like String.prototype.replace but the replacer function can return a promise.
• Named regexReplace to follow the current naming convention for async functions (simple and no hinting at asynchronous nature).

Potential implementation

async function regexReplace(
  input: string,
  regex: RegExp,
  replacer: (match: string, ...args: any[]) => string | Promise<string>,
) {
  let str = ''
  let index = 0

  let match: RegExpExecArray | null
  while ((match = regex.exec(input))) {
    const replacement = await replacer(
      ...(match as unknown as Parameters<typeof replacer>),
    )

    str += input.slice(index, match.index) + replacement
    index = match.index + match[0].length

    if (!regex.global) {
      break
    }
  }

  return str + input.slice(index)
}

[aleclarson]

I'm leaning toward this being too niche.