正则示例

温度

/^[-+]?[0-9]+(\.[0-9]*)?$/;

IPV4 地址

/^(([01]?\d\d?|2[0-4]\d|25[0-5])\.){3}([01]?\d\d?|2[0-4]\d|25[0-5])$/;

匹配浮点数

/-?([0-9]+(\.[0-9]*)?|\.[0-9]+)/;

校验 HTTP URL

/^https?://([^/:]+)(:(\d+))?(/.*)?$/i

重复检查

/^(.+)\1+$/.test("abcdabcdabcdabcd");
// output: true

Match

单词分隔

"this is a good idea".match(/\w+/g);
// output: ['this', 'is', 'a', 'good', 'idea']

处理文件路径

"/usr/local/cc.bin".match(/^(.*)\/([^/]*)$/);
// output: ['/usr/local/cc.bin', '/usr/local', 'cc.bin'

字符插入

"Toms and Jacks dot run!".replace(/(?<=\b\w+)(?=s\b)/g, "'");
// output: Tom's and Jack's dot run!

"1234567".replace(/(?<=\d)(?=(\d{3})+$)/g, ",");
// output: 1,234,567

"total: 1234567 dollors".replace(/(?<=\d)(?=(\d\d\d)+(?!\d))/g, ",");
// output: total: 1,234,567 dollors

捕获双引号内的内容

'this is "good" or "bad" idea'.match(/("[^"]*")/g);
'this is "good" or "bad" idea'.match(/(".*?")/g);
// output: ["good", "bad"]

HTML 捕获某个标签内的内容

"this is <b>good</b> or <b>bad</b> idea".match(/<b>((?!<b>).)*?<\/b>/g);
// output: ['<b>good</b>', '<b>bad</b>']

去除首位空格

const trim = (str) => {
  str = str.replace(/^\s+/, "");
  str = str.replace(/\s+$/, "");
  return str;
};