\Z - Matches if the specified characters are at the end of a string. ExpressionStringMatched? JavaScript\Z I like JavaScript 1 match I like JavaScript Programming No match JavaScript is fun No match Tip: To build and test regular expressions, you can use RegEx tester tools such as regex101...
The pattern checks if the "Jane" string is located at the beginning of the text. The Jane\. would look for "Jane" at the end of the sentence. JS regex exact matchAn exact match can be performed by placing the term between the anchors: ^ and $. exact_match.js ...
letstr="abcdefgabc";console.log(str.indexOf("a"));// 输出结果:0console.log(str.indexOf("z"));// 输出结果:-1console.log(str.indexOf("c",4))// 输出结果:9复制代码 (2)lastIndexOf() lastIndexOf():查找某个字符,有则返回最后一次匹配到的位置,否则返回-1 代码语言:javascript 代码运行次...
indexOf & lastIndexOf (可以用于数组) 代码语言:javascript 代码运行次数:0 /* 使用indexOf判断,若返回-1则不包含,若包含则返回该片段第一次出现的位置(lastIndexOf返回最后一次出现的位置)。 */"doubleam我爱你".indexOf("doubleam"); search 代码语言:javascript 代码运行次数:0 运行 AI代码解释 /* 使用...
此标记函数还适用于存储包含字符串中反斜杠的正则表达式定义：复制let regex = String.raw`\s*${10}\...
constregex =newRegExp("[\\p{Emoji}\\p{White_Space}]","v"); 用法示例:针对包含表情符号和空格的字符串测试正则表达式,展示了准确识别这些字符类型的能力。 consttestString ="Here is an emoji 😊 and some spaces";console.log(testString.match(regex));...
constregex =/ab+c/;constregex_2 =/^[a-zA-Z]+[0-9]*\W?_$/gi; 调用RegExp对象的构造函数。使用构造函数提供正则表达式的运行时编译。使用构造函数,当你知道正则表达式模式将会改变,或者你不知道模式,并从另一个来源,如用户输入。 letregex_3 =newRegExp('ab+c');letregex_4 =newRegExp(/^[a...
varmyString='javascript rox'; console.log(myString.lastIndexOf('r')); //output: 11 7. match(regexp) 根据正则表达式在字符串中搜索匹配项。如果没有找到匹配项,则返回一个信息数组或null。 //match(regexp) //select integers only varintRegex=/[0-9 -(...
// 参数:@match, p1, p2, p3, offset, string var p = 'The quick brown fox jumps over the lazy [dog]. If the [dog] reacted, was it really lazy?'; var regex = /dog/gi; //全局替换(g)和忽略大小写(i) console.log(p.replace(regex, 'ferret')); // expected output: "The quick...
targetChar,`g`);letcountRegExp=(str.match(regex)||[]).length;console.timeEnd(`RegExp`);...