4.Using string.match() method:# To check if a string contains substring or not, use the Javascriptmatchmethod. Javascript match method accepts a regular expression as a parameter and if the string contains the given substring it will return an object with details of index, substring, i...
*string:原始字符串 *substr:子字符串 *isIgnoreCase:忽略大小写 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...
if (parsed) alert("Your email address contains all valid characters."); // Stop hiding --> </SCRIPT> 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. substring()函数: 这个函数通常使用于提取字符串的任何部分。它的参数是'start' 和'end'。开始的数值是第一个字符的索引,...
JavaScript实现字符串的contains函数/ * * string:原始字符串 * substr:⼦字符串 * isIgnoreCase:忽略⼤⼩写 * / function contains(string, substr, isIgnoreCase){ if (isIgnoreCase){ string = string.toLowerCase();substr = substr.toLowerCase();} var startChar = substr.substring(0, 1);var ...
How do you check if one string contains a substring in JavaScript?Craig Buckler
string:要匹配的字符串 substr:子字符串 isIgnoreCase:是否忽略大小写 function contains(string, substr, isIgnoreCase) { if (isIgnoreCase) { string = string.toLowerCase(); substr = substr.toLowerCase(); } var startChar = substr.substring(0, 1); ...
},contains: function( what ) {/** * Returns boolean indicating whether * or not a substring exists within the string **/what = typeof what === 'string' ? what : what.toString();return this.indexOf( what ) > -1;},count: function( what ) {/**...
functioncontainsSubstring(str, substring){returnstr.includes(substring);} 21、生成指定长度的随机字母数字字符串: functiongenerateRandomAlphanumeric(length){letresult ='';constcharacters ='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';for(leti...
public string FindOne(string text) { for (int len = 1; len <= text.Length; len++) { int maxIndex = text.Length - len; for (int index = 0; index <= maxIndex; index++) { string key = text.Substring(index, len); if (m_keys.Contains(key)) ...
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. ...