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正则

e 1 jaar geleden
bovenliggende
96e6f208bc
commit
cb0ccaa455
6 gewijzigde bestanden met toevoegingen van 127 en 1 verwijderingen
Zij-aan-zij weergave Toon Diff Stats
  1. 30 0
      正则/3.元字符-边界符.html
  2. 53 0
      正则/4.元字符-量词.html
  3. 38 0
      正则/5.元字符-字符类.html
  4. BIN
      正则/元字符.jpg
  5. 6 1
      正则/总结.md
  6. BIN
      正则/量词.jpg

+ 30 - 0
正则/3.元字符-边界符.html
Bestand weergeven 

@@ -0,0 +1,30 @@
 
+<!DOCTYPE html>
 
+<html lang="en">
 
+  <head>
 
+    <meta charset="UTF-8" />
 
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
 
+    <title>Document</title>
 
+  </head>
 
+  <body>
 
+    <script>
 
+    // 1.单词边界 \b
 
+      var reg = /\ban\b/gi;
 
+      var str1 = "an Cat,is An animal";
 
+      console.log(str1.match(reg));
 
+
 
+    // 2.匹配字母首行 ^
 
+    var reg = /^ab/
 
+    console.log(reg.test("aabab"));
 
+
 
+    // 3.匹配字母尾行 $
 
+    var reg1 = /ab$/;
 
+    console.log(reg1.test("abbab"));
 
+
 
+    var reg2 = /^a$/;
 
+    console.log(reg2.test("aaa"));
 
+    console.log(reg2.test("a"));
 
+    console.log(reg2.test(" "));
 
+
 
+    </script>
 
+  </body>
 
+</html>

+ 53 - 0
正则/4.元字符-量词.html
Bestand weergeven 

@@ -0,0 +1,53 @@
 
+<!DOCTYPE html>
 
+<html lang="en">
 
+<head>
 
+    <meta charset="UTF-8">
 
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
 
+    <title>Document</title>
 
+</head>
 
+<body>
 
+    <script>
 
+        // * 0次或多次
 
+        // const reg = /a*$/;
 
+        // console.log(reg.test("aa"));
 
+        // console.log(reg.test(" "));
 
+        // console.log(reg.test("aab"));
 
+
 
+        // + 1次或多次
 
+        // const reg = /a+$/;
 
+        // console.log(reg.test("aa"));
 
+        // console.log(reg.test(" "));
 
+        // console.log(reg.test("aab"));//false
 
+
 
+        // ？ 0次或1次
 
+        // const reg = /a?a$/;
 
+        // console.log(reg.test("aa"));
 
+        // console.log(reg.test("a"));
 
+        // console.log(reg.test(" "));
 
+        // console.log(reg.test("aab"));
 
+
 
+        // {n} n次
 
+        // const reg = /a{2}$/;
 
+        // console.log(reg.test("aa"));
 
+        // console.log(reg.test("a"));
 
+        // console.log(reg.test(" "));
 
+        // console.log(reg.test("aab"));
 
+
 
+
 
+        // {n,} n次或更多次
 
+        const reg = /a{1,}$/;
 
+        // console.log(reg.test("aa"));
 
+        // console.log(reg.test("a"));
 
+        console.log(reg.test(""));
 
+        // console.log(reg.test("aab"));
 
+
 
+        // {n,m} n-m次
 
+        // const reg = /a{0,2}$/;
 
+        // console.log(reg.test("aa"));
 
+        // console.log(reg.test("a"));
 
+        // console.log(reg.test(" ")); 
+        // console.log(reg.test("aab"));
 
+
 
+    </script>
 
+</body>
 
+</html>

+ 38 - 0
正则/5.元字符-字符类.html
Bestand weergeven 

@@ -0,0 +1,38 @@
 
+<!DOCTYPE html>
 
+<html lang="en">
 
+<head>
 
+    <meta charset="UTF-8">
 
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
 
+    <title>Document</title>
 
+</head>
 
+<body>
 
+    <script>
 
+        // [] 任意匹配
 
+        const reg = /[abc]/;
 
+        console.log(reg.test("ababab"));
 
+        console.log(reg.test("abc"));
 
+        console.log(reg.test("acbacb"));
 
+        console.log(reg.test("acacac"));
 
+        console.log(reg.test("dfdfdfd"));
 
+
 
+        // 连字符 -
 
+        const reg1 = /0-9/;//匹配数字
 
+        const reg2 = /a-z/;//匹配小写英文字母
 
+        const reg3 = /A-Z/;//匹配大写英文字母
 
+        const reg4 = /a-zA-Z0-9_/; //匹配英文字母+数字+下划线
 
+
 
+        // ^ 取反
 
+        // const reg6 = /[^0-9]/;
 
+        const reg6 = /\d/;
 
+        console.log(reg6.test("aaa"));
 
+
 
+        // . 除换行以外的任意字符
 
+        const reg7 = /./;
 
+        console.log(reg7.test("aaa"));
 
+        console.log(reg7.test("1234567890"));
 
+        console.log(reg7.test(""));// false
 
+        console.log(reg7.test("\n"));
 
+        console.log(reg7.test("\r"));
 
+    </script>
 
+</body>
 
+</html>

BIN
正则/元字符.jpg
Bestand weergeven


+ 6 - 1
正则/总结.md
Bestand weergeven 

@@ -7,4 +7,9 @@
 
 
 ### 修饰符
 
 i 不区分大小写
 
-g 匹配全局
 
+g 匹配全局
 
+
 
+### 元字符
 
+ 1. 边界符
 
+ 2. 量词
 
+ 3. 字符类

BIN
正则/量词.jpg
Bestand weergeven