{"id":2139,"date":"2025-03-01T00:10:28","date_gmt":"2025-02-28T16:10:28","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=2139"},"modified":"2025-03-01T00:10:28","modified_gmt":"2025-02-28T16:10:28","slug":"javascript-regexp-%e5%af%b9%e8%b1%a1","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/03\/01\/javascript-regexp-%e5%af%b9%e8%b1%a1\/","title":{"rendered":"JavaScript RegExp \u5bf9\u8c61"},"content":{"rendered":"\n

RegExp<\/code> \u662f JavaScript \u4e2d\u7528\u4e8e\u5904\u7406\u6587\u672c\u6a21\u5f0f\u5339\u914d\uff08\u6b63\u5219\u8868\u8fbe\u5f0f\uff09\u7684\u5185\u7f6e\u5bf9\u8c61\u3002\u5b83\u53ef\u4ee5\u7528\u6765\u6267\u884c\u6587\u672c\u641c\u7d22\u3001\u66ff\u6362\u3001\u63d0\u53d6\u548c\u9a8c\u8bc1\u7b49\u64cd\u4f5c\u3002\u901a\u8fc7\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\uff0c\u60a8\u53ef\u4ee5\u5feb\u901f\u3001\u7075\u6d3b\u5730\u5904\u7406\u5b57\u7b26\u4e32\u4e2d\u7684\u6a21\u5f0f\u5339\u914d\u3002<\/p>\n\n\n\n

1. RegExp \u5bf9\u8c61\u7684\u521b\u5efa<\/strong><\/h3>\n\n\n\n

RegExp<\/code> \u5bf9\u8c61\u6709\u4e24\u79cd\u521b\u5efa\u65b9\u5f0f\uff1a<\/p>\n\n\n\n

1.1 \u4f7f\u7528\u5b57\u9762\u91cf<\/strong><\/h4>\n\n\n\n
let regex = \/pattern\/;<\/code><\/pre>\n\n\n\n
1.2 \u4f7f\u7528 RegExp \u6784\u9020\u51fd\u6570<\/strong><\/h4>\n\n\n\n
let regex = new RegExp('pattern');<\/code><\/pre>\n\n\n\n
\u6784\u9020\u51fd\u6570\u53ef\u4ee5\u63a5\u53d7\u4e24\u4e2a\u53c2\u6570\uff1a<\/p>\n\n\n\n
    \n
  • \u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u6a21\u5f0f\uff08\u6b63\u5219\u8868\u8fbe\u5f0f\uff09\u3002<\/li>\n\n\n\n
  • \u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u6807\u5fd7\uff08\u5982 g<\/code>\u3001i<\/code>\u3001m<\/code> \u7b49\uff0c\u8868\u793a\u4e0d\u540c\u7684\u5339\u914d\u9009\u9879\uff09\u3002<\/li>\n<\/ul>\n\n\n\n
    2. RegExp \u5bf9\u8c61\u7684\u5e38\u7528\u65b9\u6cd5<\/strong><\/h3>\n\n\n\n
    2.1 test()<\/code><\/strong><\/h4>\n\n\n\n
    test()<\/code> \u65b9\u6cd5\u7528\u4e8e\u68c0\u67e5\u5b57\u7b26\u4e32\u662f\u5426\u5339\u914d\u6b63\u5219\u8868\u8fbe\u5f0f\u3002\u5982\u679c\u5b57\u7b26\u4e32\u5339\u914d\u6a21\u5f0f\uff0c\u5219\u8fd4\u56de true<\/code>\uff0c\u5426\u5219\u8fd4\u56de false<\/code>\u3002<\/p>\n\n\n\n
    let regex = \/hello\/;\nconsole.log(regex.test('hello world'));  \/\/ \u8f93\u51fa\uff1atrue\nconsole.log(regex.test('world hello'));  \/\/ \u8f93\u51fa\uff1atrue\nconsole.log(regex.test('hi there'));    \/\/ \u8f93\u51fa\uff1afalse<\/code><\/pre>\n\n\n\n
    2.2 exec()<\/code><\/strong><\/h4>\n\n\n\n
    exec()<\/code> \u65b9\u6cd5\u7528\u4e8e\u5728\u5b57\u7b26\u4e32\u4e2d\u6267\u884c\u641c\u7d22\u3002\u5982\u679c\u5339\u914d\u6210\u529f\uff0c\u8fd4\u56de\u4e00\u4e2a\u6570\u7ec4\uff0c\u5305\u542b\u5339\u914d\u7684\u7ed3\u679c\u3002\u5982\u679c\u6ca1\u6709\u627e\u5230\u5339\u914d\uff0c\u8fd4\u56de null<\/code>\u3002<\/p>\n\n\n\n
    let regex = \/world\/;\nlet result = regex.exec('hello world');\nconsole.log(result);  \/\/ \u8f93\u51fa\uff1a[\"world\", index: 6, input: \"hello world\", groups: undefined]<\/code><\/pre>\n\n\n\n
    \u5982\u679c\u6b63\u5219\u8868\u8fbe\u5f0f\u5e26\u6709\u5168\u5c40\u6807\u5fd7 g<\/code>\uff0cexec()<\/code> \u4f1a\u8fd4\u56de\u591a\u4e2a\u5339\u914d\u7ed3\u679c\u3002<\/p>\n\n\n\n
    let regex = \/o\/g;\nlet result = regex.exec('hello world');\nconsole.log(result);  \/\/ \u8f93\u51fa\uff1a[\"o\", index: 4, input: \"hello world\", groups: undefined]\n\nresult = regex.exec('hello world');\nconsole.log(result);  \/\/ \u8f93\u51fa\uff1a[\"o\", index: 7, input: \"hello world\", groups: undefined]<\/code><\/pre>\n\n\n\n
    2.3 match()<\/code><\/strong><\/h4>\n\n\n\n
    match()<\/code> \u65b9\u6cd5\u7528\u4e8e\u68c0\u7d22\u5b57\u7b26\u4e32\u4e2d\u662f\u5426\u6709\u5339\u914d\u7684\u5b50\u5b57\u7b26\u4e32\u3002\u5982\u679c\u627e\u5230\u5339\u914d\uff0c\u5b83\u4f1a\u8fd4\u56de\u5339\u914d\u7684\u7ed3\u679c\uff1b\u5982\u679c\u6ca1\u6709\u627e\u5230\u5339\u914d\uff0c\u8fd4\u56de null<\/code>\u3002<\/p>\n\n\n\n
    let str = 'hello world';\nlet result = str.match(\/hello\/);\nconsole.log(result);  \/\/ \u8f93\u51fa\uff1a[\"hello\"]<\/code><\/pre>\n\n\n\n
    \u5982\u679c\u6b63\u5219\u8868\u8fbe\u5f0f\u4f7f\u7528\u4e86\u5168\u5c40\u6807\u5fd7 g<\/code>\uff0c\u5219\u4f1a\u8fd4\u56de\u6240\u6709\u5339\u914d\u7684\u7ed3\u679c\uff1a<\/p>\n\n\n\n
    let str = 'hello hello hello';\nlet result = str.match(\/hello\/g);\nconsole.log(result);  \/\/ \u8f93\u51fa\uff1a[\"hello\", \"hello\", \"hello\"]<\/code><\/pre>\n\n\n\n
    2.4 replace()<\/code><\/strong><\/h4>\n\n\n\n
    replace()<\/code> \u65b9\u6cd5\u7528\u4e8e\u5c06\u5339\u914d\u7684\u5b50\u5b57\u7b26\u4e32\u66ff\u6362\u4e3a\u6307\u5b9a\u7684\u5185\u5bb9\u3002\u5982\u679c\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u548c\u5e26\u6709\u5168\u5c40\u6807\u5fd7 g<\/code>\uff0c\u5219\u4f1a\u66ff\u6362\u6240\u6709\u5339\u914d\u7684\u90e8\u5206\u3002<\/p>\n\n\n\n
    let str = 'hello world';\nlet result = str.replace(\/world\/, 'everyone');\nconsole.log(result);  \/\/ \u8f93\u51fa\uff1ahello everyone<\/code><\/pre>\n\n\n\n
    \u5982\u679c\u4f7f\u7528\u5168\u5c40\u6807\u5fd7 g<\/code>\uff0c\u5219\u4f1a\u66ff\u6362\u6240\u6709\u5339\u914d\u7684\u90e8\u5206\uff1a<\/p>\n\n\n\n
    let str = 'hello hello hello';\nlet result = str.replace(\/hello\/g, 'hi');\nconsole.log(result);  \/\/ \u8f93\u51fa\uff1ahi hi hi<\/code><\/pre>\n\n\n\n
    2.5 search()<\/code><\/strong><\/h4>\n\n\n\n
    search()<\/code> \u65b9\u6cd5\u7528\u4e8e\u8fd4\u56de\u6b63\u5219\u8868\u8fbe\u5f0f\u5339\u914d\u5230\u7684\u7b2c\u4e00\u4e2a\u4f4d\u7f6e\u3002\u5982\u679c\u6ca1\u6709\u5339\u914d\u5230\uff0c\u8fd4\u56de -1<\/code>\u3002<\/p>\n\n\n\n
    let str = 'hello world';\nlet result = str.search(\/world\/);\nconsole.log(result);  \/\/ \u8f93\u51fa\uff1a6<\/code><\/pre>\n\n\n\n
    2.6 split()<\/code><\/strong><\/h4>\n\n\n\n
    split()<\/code> \u65b9\u6cd5\u6839\u636e\u6b63\u5219\u8868\u8fbe\u5f0f\u5206\u5272\u5b57\u7b26\u4e32\u5e76\u8fd4\u56de\u4e00\u4e2a\u6570\u7ec4\u3002<\/p>\n\n\n\n
    let str = 'apple,banana,orange';\nlet result = str.split(\/,\/);\nconsole.log(result);  \/\/ \u8f93\u51fa\uff1a[\"apple\", \"banana\", \"orange\"]<\/code><\/pre>\n\n\n\n
    3. \u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u5e38\u89c1\u6807\u5fd7\uff08Flags\uff09<\/strong><\/h3>\n\n\n\n
    \u6b63\u5219\u8868\u8fbe\u5f0f\u53ef\u4ee5\u5e26\u6709\u4e0d\u540c\u7684\u6807\u5fd7\uff0c\u6807\u5fd7\u51b3\u5b9a\u4e86\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u5339\u914d\u884c\u4e3a\u3002<\/p>\n\n\n\n
    3.1 g<\/code>\uff08\u5168\u5c40\u5339\u914d\uff09<\/strong><\/h4>\n\n\n\n
    g<\/code> \u6807\u5fd7\u8868\u793a\u5168\u5c40\u5339\u914d\uff0c\u610f\u5473\u7740\u4f1a\u627e\u5230\u6240\u6709\u5339\u914d\u9879\uff0c\u800c\u4e0d\u4ec5\u4ec5\u662f\u7b2c\u4e00\u4e2a\u3002<\/p>\n\n\n\n
    let regex = \/o\/g;\nlet result = 'hello world'.match(regex);\nconsole.log(result);  \/\/ \u8f93\u51fa\uff1a[\"o\", \"o\"]<\/code><\/pre>\n\n\n\n
    3.2 i<\/code>\uff08\u5ffd\u7565\u5927\u5c0f\u5199\uff09<\/strong><\/h4>\n\n\n\n
    i<\/code> \u6807\u5fd7\u8868\u793a\u5ffd\u7565\u5927\u5c0f\u5199\u8fdb\u884c\u5339\u914d\u3002<\/p>\n\n\n\n
    let regex = \/hello\/i;\nconsole.log(regex.test('Hello'));  \/\/ \u8f93\u51fa\uff1atrue\nconsole.log(regex.test('HELLO'));  \/\/ \u8f93\u51fa\uff1atrue\nconsole.log(regex.test('HeLLo'));  \/\/ \u8f93\u51fa\uff1atrue<\/code><\/pre>\n\n\n\n
    3.3 m<\/code>\uff08\u591a\u884c\u5339\u914d\uff09<\/strong><\/h4>\n\n\n\n
    m<\/code> \u6807\u5fd7\u4f7f\u5f97 ^<\/code> \u548c $<\/code> \u5339\u914d\u884c\u7684\u5f00\u59cb\u548c\u7ed3\u675f\uff0c\u800c\u4e0d\u4ec5\u4ec5\u662f\u5b57\u7b26\u4e32\u7684\u5f00\u59cb\u548c\u7ed3\u675f\u3002<\/p>\n\n\n\n
    let regex = \/^hello\/m;\nconsole.log(regex.test('hello\\nworld'));  \/\/ \u8f93\u51fa\uff1atrue<\/code><\/pre>\n\n\n\n
    3.4 s<\/code>\uff08dotAll\u6a21\u5f0f\uff09<\/strong><\/h4>\n\n\n\n
    s<\/code> \u6807\u5fd7\u4f7f\u5f97 .<\/code> \u53ef\u4ee5\u5339\u914d\u6362\u884c\u7b26\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c.<\/code> \u4e0d\u4f1a\u5339\u914d\u6362\u884c\u7b26\u3002<\/p>\n\n\n\n
    let regex = \/hello.world\/s;\nconsole.log(regex.test('hello\\nworld'));  \/\/ \u8f93\u51fa\uff1atrue<\/code><\/pre>\n\n\n\n
    3.5 u<\/code>\uff08Unicode\uff09<\/strong><\/h4>\n\n\n\n
    u<\/code> \u6807\u5fd7\u542f\u7528 Unicode \u6a21\u5f0f\uff0c\u5141\u8bb8\u5904\u7406\u4e00\u4e9b\u7279\u6b8a\u5b57\u7b26\u3002<\/p>\n\n\n\n
    let regex = \/\\u{1F600}\/u;\nconsole.log(regex.test('\ud83d\ude00'));  \/\/ \u8f93\u51fa\uff1atrue<\/code><\/pre>\n\n\n\n
    3.6 y<\/code>\uff08\u7c98\u6027\u5339\u914d\uff09<\/strong><\/h4>\n\n\n\n
    y<\/code> \u6807\u5fd7\u542f\u7528\u7c98\u6027\u5339\u914d\uff0c\u610f\u5473\u7740\u5339\u914d\u53ea\u80fd\u4ece\u5f53\u524d\u4f4d\u7f6e\u5f00\u59cb\uff0c\u800c\u4e0d\u662f\u8df3\u8fc7\u524d\u9762\u7684\u5b57\u7b26\u3002<\/p>\n\n\n\n
    let regex = \/hello\/y;\nconsole.log(regex.exec('hello world'));  \/\/ \u8f93\u51fa\uff1a[\"hello\", index: 0, input: \"hello world\", groups: undefined]\nconsole.log(regex.exec('world hello'));  \/\/ \u8f93\u51fa\uff1anull<\/code><\/pre>\n\n\n\n
    4. \u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u5e38\u89c1\u7528\u6cd5<\/strong><\/h3>\n\n\n\n
    4.1 \u9a8c\u8bc1\u90ae\u7bb1\u5730\u5740<\/strong><\/h4>\n\n\n\n
    let regex = \/^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\\.[a-zA-Z]{2,}$\/;\nconsole.log(regex.test('test@example.com'));  \/\/ \u8f93\u51fa\uff1atrue\nconsole.log(regex.test('invalid-email'));    \/\/ \u8f93\u51fa\uff1afalse<\/code><\/pre>\n\n\n\n
    4.2 \u63d0\u53d6\u6570\u5b57<\/strong><\/h4>\n\n\n\n
    let str = 'Price: $123.45';\nlet regex = \/\\d+\\.\\d+\/;\nlet result = str.match(regex);\nconsole.log(result);  \/\/ \u8f93\u51fa\uff1a[\"123.45\"]<\/code><\/pre>\n\n\n\n
    4.3 \u66ff\u6362\u591a\u4e2a\u7a7a\u683c\u4e3a\u5355\u4e2a\u7a7a\u683c<\/strong><\/h4>\n\n\n\n
    let str = 'This   is   a   test';\nlet result = str.replace(\/\\s+\/g, ' ');\nconsole.log(result);  \/\/ \u8f93\u51fa\uff1aThis is a test<\/code><\/pre>\n\n\n\n
    4.4 \u53bb\u9664\u5b57\u7b26\u4e32\u4e2d\u7684\u7a7a\u767d\u5b57\u7b26<\/strong><\/h4>\n\n\n\n
    let str = '  Hello World  ';\nlet result = str.replace(\/^\\s+|\\s+$\/g, '');\nconsole.log(result);  \/\/ \u8f93\u51fa\uff1aHello World<\/code><\/pre>\n\n\n\n
    5. \u603b\u7ed3<\/strong><\/h3>\n\n\n\n
    JavaScript \u7684 RegExp<\/code> \u5bf9\u8c61\u5f3a\u5927\u800c\u7075\u6d3b\uff0c\u662f\u6587\u672c\u5904\u7406\u548c\u5b57\u7b26\u4e32\u64cd\u4f5c\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u5de5\u5177\u3002\u901a\u8fc7\u6b63\u5219\u8868\u8fbe\u5f0f\uff0c\u60a8\u53ef\u4ee5\u5feb\u901f\u6709\u6548\u5730\u5339\u914d\u3001\u66ff\u6362\u3001\u9a8c\u8bc1\u548c\u63d0\u53d6\u5b57\u7b26\u4e32\u4e2d\u7684\u4fe1\u606f\u3002\u638c\u63e1\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u8bed\u6cd5\u548c\u4f7f\u7528\u65b9\u6cd5\uff0c\u5c06\u5927\u5927\u63d0\u5347\u60a8\u7684\u5f00\u53d1\u6548\u7387\u3002\u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
    RegExp \u662f JavaScript \u4e2d\u7528\u4e8e\u5904\u7406\u6587\u672c\u6a21\u5f0f\u5339\u914d\uff08\u6b63\u5219\u8868\u8fbe\u5f0f\uff09\u7684\u5185\u7f6e\u5bf9\u8c61\u3002\u5b83\u53ef\u4ee5\u7528\u6765\u6267\u884c\u6587\u672c\u641c\u7d22 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[46],"tags":[],"class_list":["post-2139","post","type-post","status-publish","format-standard","hentry","category-javascript"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2139","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=2139"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2139\/revisions"}],"predecessor-version":[{"id":2140,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2139\/revisions\/2140"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=2139"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=2139"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=2139"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}