function contains(string, substr, isIgnoreCase) { if (isIgnoreCase) { string = string.toLowerCase(); substr = substr.toLowerCase(); } var startChar = substr.substring(0, 1); var strLen = substr.length; for (var j = 0; j<string.length - strLen + 1; j++) { if (string.charAt(...
To check if a Javascript String Contains a substring or not, we can use 7 different Javascript methods as listed in below table.
let str3 = 'JavaScript';if (str3.includes('Script')) { alert(`The string "${str3}" contains "Script".`);} else { alert(`The string "${str3}" does not contain "Script".`);} 五、注意事项 1、includes()方法区分大小写。2、如果搜索字符串为空，则返回true。3、如果指定的起始位置大...
How do you check if one string contains a substring in JavaScript?Craig Buckler
Check if a string includes "world": lettext ="Hello world, welcome to the universe."; letresult = text.includes("world"); Try it Yourself » More examples below. Description Theincludes()method returnstrueif a string contains a specified string. ...
console.log(containsProfanity(message)); // true 3. 路径处理:在URL、文件路径或目录结构中,检查是否包含特定路径片段、文件扩展名等。 function isImageFile(path) { return path.endsWith(".jpg") || path.endsWith(".png") || path.includes(".jpeg"); ...
includes()Returns if a string contains a specified value indexOf()Returns the index (position) of the first occurrence of a value in a string lastIndexOf()Returns the index (position) of the last occurrence of a value in a string
<c:iftest="${fn:contains(str,subStr)==true}"></c:if> 2、JavaScript if(str.indexOf(subStr) >= 0) { } 3. Java中字符串中子串的查找共有四种方法,如下: ① int indexOf(String str) :返回第一次出现的指定子字符串在此字符串中的索引。 ②...
console.log(check3); // false let check4 = sentence.includes(""); console.log(check4); // true Run Code Output true false false false true Also Read: JavaScript String indexOf() JavaScript Array includes() JavaScript Program to Check Whether a String Contains a Substring Share...
if(!String.prototype.includes){String.prototype.includes=function(search,start){'use strict';if(typeofstart!=='number'){start=0;}if(start+search.length>this.length){returnfalse;}else{returnthis.indexOf(search,start)!==-1;}};} 规范 ...