如果我定义了这样的类型:type Name =string| Regex并将它传递给一个函数,那么TypeScript有什么方法来发现哪种类型被传递呢?JavaScript很容易找到这方面的答案,但对于TypeScript,我还在苦苦挣扎。也许这是因为答案是一样的,但我希望有一种编译时检查的方法。
// 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...
const regex = new RegExp(/^a...s$/); console.log(regex.test('alias')); // true Run Code In the above example, the string alias matches with the RegEx pattern /^a...s$/. Here, the test() method is used to check if the string matches the pattern. There are several other ...
const str = 'sun and moon';const regex = /and/;const matchObj = regex.exec(str);// [ 'and', index: 4, input: 'sun and moon', groups: undefined ]console.log(matchObj); 我们现在可以指定一个 d 正则表达式标志来获取匹配开始和结束的两个索引。 代码语言:javascript 代码运行次数:0 运行 ...
我在上一篇博客里谈到了javascript里面的String类的replace方法的一些问题,今天我真正的学习了javascript里的正则表达式的用法(以前总是不屑学习这个技术,现在发现编程里字符处理的技术还是相当的重要,应用领域很广泛而且也有一定难度,比如jQuery源码里面就有很多正则表达式的使用),对于String类里s.replace(regex,function(){...
consttext ="Java is awesome. Java is fun.";// passing a string as the first parameter letpattern ="Java";letnew_text = text.replaceAll(pattern,"JavaScript"); console.log(new_text);// passing a regex as the first parameter pattern =/Java/g; ...
// Lets use a regular expression to match a date string.varre =/([a-zA-Z]+) (\d+)/;if(re.test("June 24")) {// Indeed, the expression "([a-zA-Z]+) (\d+)" matches the date string// If we want, we can instead search the string to find where the pattern// matches in...
const regex = /Dog/i; console.log(p.replace(regex, 'ferret')); // expected output: "The quick brown fox jumps over the lazy ferret. If the dog reacted, was it really lazy?" 1. 2. 3. ``` 18、search() 执行正则表达式和 String 对象之间的一个搜索匹配 ...
(array, string, number, regex): 包含着一系列对象,这些对象的属性上有对应类型变量的引用。 (compiled code): Javascript引擎(如V8)为了加快运行速度,会对代码进行一次编译。(compiled code)顾名思义就是指与编译后的代码相关联的内存。 Detached HTMLDivElement等:代码里对指定类型Dom节点的引用。
template string '' Base HTML to use when creating the tooltip. The tooltip's title will be injected into the .tooltip-inner. .tooltip-arrow will become the tooltip's arrow. The outermost wrapper element should have the .tooltip class. title string | function '' Default title value if title...