const regexCaseSensitive = /FOO/; // 区分大小写const regexCaseInsensitive = /FOO/i; // 不区分大小写const str = 'FOO and foo';const matchesCaseSensitive = str.match(regexCaseSensitive);const matchesCaseInsensitive = str.match(regexCaseInsensitive);console.log(matchesCaseSensitive); // 输出: ...
let searchString = "blue"; let flags = "gi"; // global, case-insensitive let regex = new RegExp(searchString, flags); let text = "Blue, blue, electric blue"; let result = text.replace(regex, "red"); console.log(result); // "red, red, electric red" 通过确切的理解和技巧,JavaS...
JS regex case insensitive matchTo enable case insensitive search, we use the i flag. case_insensitive.js let words = ['dog', 'Dog', 'DOG', 'Doggy']; let pattern = /dog/i; words.forEach(word => { if (pattern.test(word)) { console.log(`the ${word} matches`); } }); ...
Alias No match An abacus No match Create a RegEx There are two ways you can create a regular expression in JavaScript. Using a regular expression literal: The regular expression consists of a pattern enclosed between slashes /. For example, const regularExp = /abc/; Here, /abc/ is a re...
// after first match. var regexInsensitive = /abc/i; console.log(regexInsensitive.test('Abc')); // returns true, because the case of string characters don't matter // in case-insensitive search. 字符组(Character groups): character groups [xyz] 允许在同一个位置匹配多个字符,只需要满足其中...
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。 因此,一个正则表达式就是一个模式与上述 3 个标志的组合体。不同组合产生不同结果,如下面的例子所示。
const caseInsensitiveRegex = /ignore case/i; const testString = 'We use the i flag to iGnOrE CasE'; caseInsensitiveRegex.test(testString); // true 提取变量的第一个匹配项 使用.match()方法 const match = "Hello World!".match(/hello/i); // "Hello" ...
http://mengzhuo.org/regex/(一个在线正则表达式验证器)。 让我们看看这下面这个例子: 1/*2* 匹配第一个"bat"或“cat”,不区分大小写3*/4varpattern1=/[bc]at/i;5/*6* 和pattern1相同,只不过是用来了构造函数创建7*/8varpattern2=newRegExp("[bc]at","i"); ...
alert("Chapter 5.1".match(regexp)); // 5.1 锚点:^ 和 $ ^The 匹配任何以“The”开头的字符串 -> Try it! (https://regex101.com/r/cO8lqs/2) end$ 匹配以“end”为结尾的字符串 ^The end$ 抽取匹配从“The”开始到“end”结束的字符串 ...
g- allows you to runRegExp.exec()multiple times to find every match in the input string until the method returnsnull. i- makes the pattern case insensitive so that it matches strings of different capitalizations m- is necessary if your input string has newline characters (\n), this flag ...