Javascript_引用类型_RegExp

2017-02-10 10:31:48 Albin Wong 497

* Exercise1:

<script>
		    //正则表达式的声明1
		    //格式：/正则/模式修正符
		    var pattern1 = /s$/i;
		    console.log(pattern1 instanceof RegExp);
		
		    //正则表达式的声明2
		    //格式：new RegExp('正则','模式修正符');
		    var pattern2 = new RegExp('s$','i');
		    console.log(pattern2 instanceof RegExp);
		
		</script>

* Exercise2:

<script>
		    var pattern = /s$/i;
		
		    //是否设置了g标志
		    console.log(pattern.global);
		    //是否设置了i标志
		    console.log(pattern.ignoreCase);
		    //是否设置了m标志
		    console.log(pattern.multiline);
		</script>

* Exercise3:

<script>
		    var pattern = /sb/i;
		    //返回一个数组，其中存放匹配的结果，如果没有找到返回null
		    //数组的0是正则匹配到的文本，第一个元素是正则第一个子表达式匹配的结果和PHP中preg_match_all()一样
		    var result = pattern.exec('sbysb');
		    console.log(result);
		
		    //index属性表示匹配项在字符串中的位置
		    console.log(result.index);
		
		    //input属性表示应用正则表达式的字符串
		    console.log(result.input);
		
		</script>

* Exercise4:

<script>
		    var pattern = /sb/g;
		    //对于exec()而言，即使在模式中设置了全局标志（g）
		    //每次只会返回一个匹配项
		    //不设置全局标志的情况下，在同一个字符串上多次调用exec()将始终返回第一个匹配项的信息
		    var result = pattern.exec('sbysb');
		    console.log(result);
		    console.log(result.index);
		
		    //设置全局标志的情况下，在同一个字符串上多次调用exec()将会在字符串中继续查找新匹配项
		    result = pattern.exec('sbysb');
		    console.log(result);
		    console.log(result.index);
		
		
		</script>

* Exercise5:

<script>
		    var pattern = /sb/g;
		    //test(),接受一个字符串参数，在能够匹配的情况下返回true返回false
		    var result = pattern.test('sbysb');
		    console.log(result);
		</script>

* Exercise6:

<script>
		    var text = 'this has been as short summer';
		    var pattern = /(.)hort/g;
		
		    pattern.test(text);
		
		    //input，最近一次要匹配出来的字符串
		    console.log(RegExp.input);
		
		    //lastMatch，最近一次的匹配项
		    console.log(RegExp.lastMatch);
		
		    //leftContext，input字符串中lastMatch之前的文本
		    console.log(RegExp.leftContext);
		
		    //rightContext，input字符串中lastMatch之后的文本
		    console.log(RegExp.rightContext);
		
		    //lastParen，最近一次匹配的捕获组
		    console.log(RegExp.lastParen);
		</script>

(3) Comments

John Doe- Reply

February 26, 2013 at 1:18 pm
- saqib sarwar- Reply
  
  February 26, 2013 at 1:20 pm
  
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John Doe- Reply

February 26, 2013 at 1:27 pm

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