Use the localeCompare() String Method to Do Case Insensitive Comparison in JavaScript While the method above gives an easy answer, it may not work well where the strings include Unicode characters. The localeCompare string method can take care of this. It is used with the sensitivity: 'base...
We look at the defaultArray.prototype.sortbehavior and discuss how you can do case insensitive string sorting. const foo =['Alpha','beta','Gamma','delta']; foo.sort((a, b)=>a.toLowerCase().localeCompare(b.toLowerCase())); foo.forEach(x=>console.log(x));/*"Alpha" "beta" "del...
如果要对字符串数组进行排序，忽略大小写，函数特别有用：const strings = ['Alpha', 'Zeta', 'alpha', 'zeta'];strings.sort((str1, str2) => str1.localeCompare(str2, undefined, { sensitivity: 'accent' }));// Case insensitive sorting: ['Alpha', 'alpha', 'Zeta', 'zeta']strings;不使用...
在上次的文章中我们也提到过,正则修饰符一共有以下几种,可以单独使用,也可以组合使用: /\w+/g;//global search/\w+/i;//ignore case/\w+/m;//multi-line/\w+/u;//unicode/\w+/y;//sticky/\w+/gi;newRegExp('\\w+', 'gi'); 其中的i好理解,正如上面的注释一样,ignore case或case insensi...
i:表示不区分大小写(case-insensitive)模式,即在确定匹配项时忽略模式与字符串的大小写; m:表示多行(multiline)模式,即在到达一行文本末尾时还会继续查找下一行中是否存在与模式匹配的项。 正则表达式模式中使用的所有元字符都必须转义,元字符包括:( [ { \ ^ $ | ) ? * + . ] }。
const str = 'arya stark';// The most concise way to check substrings ignoring case is using// `String#match()` and a case-insensitive regular expression (the 'i')str.match(/Stark/i); // truestr.match(/Snow/i); // false// You can also convert both the string and the search ...
conststr="Hello, World!";constsearchValue="world";if(str.toLowerCase().includes(searchValue.toLowerCase())){console.log(`${searchValue}is found (case-insensitive).`);} 2. 从指定位置开始查找:虽然includes()本身不支持从指定索引开始查找,但可以通过截取子字符串实现类似效果。
In the preceding case, we have the characters NaN because the JavaScript engine returns NaN after our code and allows us to convert it into a string using +‘'. Now we continue with a more complex example. We walk through the process of creating the string “alert” by using native ...
To make the String.includes() method case insensitive, convert both of the strings in the comparison to lowercase. A case-insensitive comparison is done by converting the two strings to the same case. index.js const str = 'HELLO WORLD'; const substr = 'hELLo'; // 👇️ true console....
To do a case-insensitive string replacement in JavaScript call the `String.replace` method and set the `ignore` flag on the first parameter.