正则表达式解析图书查询字符串：双引号相关问题排查

我正在解析图书查询字符串，其中intitle:这类前缀用于指定图书的特定查询字段，目前遇到两个问题：

• 无法解析返回结果中第三个元素里的inauthor、inpublisher等字段，比如champ inauthor:"john smith" inpublisher:"the book place"，怀疑和字符串中的双引号有关
• 如何通过双引号将内容识别为单个术语

待解析字符串 #

basketball intitle:champ inauthor:"john smith" inpublisher:"the book place" subject: fiba isbn: 12345 lccn: 689778 oclc: 1234156

尝试的代码 #

let q: string = `basketball intitle:champ inauthor:"john smith" inpublisher:"the book place" subject: fiba isbn: 12345 lccn: 689778 oclc: 1234156`;
console.log(q);
q = q.replaceAll(`: `, `:`);
console.log(q);
let all = q.split(
  /(\bintitle:\b|\binauthor:\b|\binpublisher:\b|\bsubject:\b|\bisbn:\b|\blccn:\b|\boclc:\b)/,
);
console.log(all);

返回结果 #

[
  'basketball ',
  'intitle:',
  'champ inauthor:"john smith" inpublisher:"the book place" ',
  'subject:',
  'fiba ',
  'isbn:',
  '12345 ',
  'lccn:',
  '689778 ',
  'oclc:',
  '1234156'
]

解决方案 #

问题分析 #

当前用正则分割的方式无法处理带双引号的内容：正则匹配字段前缀时，会被双引号内的空格干扰，导致inauthor:和inpublisher:没有被识别为分割标记，进而无法拆分对应字段。

解决思路 #

编写能识别双引号内内容的正则，遍历字符串提取字段和对应值：

1. 先统一去掉字段前缀后多余的空格（比如subject: fiba转为subject:fiba）
2. 用正则匹配三种内容：字段前缀、双引号包裹的内容、普通单词
3. 先提取无前缀的搜索词，再逐个匹配带前缀的字段及其对应值

示例代码 #

const q = `basketball intitle:champ inauthor:"john smith" inpublisher:"the book place" subject: fiba isbn: 12345 lccn: 689778 oclc: 1234156`;
// 统一去除冒号后的空格
const processed = q.replace(/:\s+/g, ':');

// 正则规则：匹配字段前缀、双引号内内容、普通单词
const regex = /(\b(?:intitle|inauthor|inpublisher|subject|isbn|lccn|oclc):)|"([^"]+)"|(\S+)/g;
const result: { [key: string]: string[] } = { keywords: [] };
let currentField: string | null = null;

let match;
while ((match = regex.exec(processed)) !== null) {
  if (match[1]) {
    // 匹配到字段前缀，记录当前字段（去掉末尾冒号）
    currentField = match[1].slice(0, -1);
    result[currentField] = [];
  } else if (match[2]) {
    // 匹配到双引号内容，归入当前字段或关键词
    if (currentField) {
      result[currentField].push(match[2]);
    } else {
      result.keywords.push(match[2]);
    }
  } else if (match[3]) {
    // 匹配到普通单词，归入当前字段或关键词
    if (currentField) {
      result[currentField].push(match[3]);
    } else {
      result.keywords.push(match[3]);
    }
  }
}

console.log(result);

输出结果 #

{
  keywords: ['basketball'],
  intitle: ['champ'],
  inauthor: ['john smith'],
  inpublisher: ['the book place'],
  subject: ['fiba'],
  isbn: ['12345'],
  lccn: ['689778'],
  oclc: ['1234156']
}

内容的提问来源于stack exchange，提问作者mateoc15