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// Copyright 2018-2024 the oak authors. All rights reserved. MIT license.
/** With a provided attribute pattern, return a RegExp which will match and * capture in the first group the value of the attribute from a header value. */export function toParamRegExp(  attributePattern: string,  flags?: string,): RegExp {  // deno-fmt-ignore  return new RegExp(    `(?:^|;)\\s*${attributePattern}\\s*=\\s*` +    `(` +      `[^";\\s][^;\\s]*` +    `|` +      `"(?:[^"\\\\]|\\\\"?)+"?` +    `)`,    flags  );}
/** Unquotes attribute values that might be pass as part of a header. */export function unquote(value: string): string {  if (value.startsWith(`"`)) {    const parts = value.slice(1).split(`\\"`);    for (let i = 0; i < parts.length; ++i) {      const quoteIndex = parts[i].indexOf(`"`);      if (quoteIndex !== -1) {        parts[i] = parts[i].slice(0, quoteIndex);        parts.length = i + 1; // Truncates and stops the loop      }      parts[i] = parts[i].replace(/\\(.)/g, "$1");    }    value = parts.join(`"`);  }  return value;}