str3="The contract was declared null and void."; str1.match("number");// "number" 是个字符串,返回["number"] str1.match(NaN);// NaN 的数据类型是数字,返回 ["NaN"] str1.match(Infinity);// Infinity 的数据类型是数字,返回 ["Infinity"] str1.match(+Infinity);// 返回 ["Infinity"] ...
第一种方法是用了String类里的match方法,用正则表达式当参数; 在chrome里监控这个str_result变量,他会返回一个数组,数组的每个元素分别是一个数字 如图: 也就是说,它会返回所有的和正则表达式匹配的字符串,每个放在一个数组元素中,数组的长度也就是陪配的总个数。 第二种方法是用了RegExp中的exec方法,用需要匹...
Thematch()method returns the result of matching astringagainst aregular expression. Example constmessage ="JavaScript is a fun programming language.";// regular expression that checks if message contains 'programming'constexp =/programming/; // check if exp is present in messageletresult = message...
如果String.prototype.match()参数的正则表达式中没有包含g修饰符,str.match()将会和RegExp.prototype.exec()方法返回一样的结果。 如果只想知道一个字符串是否匹配一个正则表达式,使用RegExp.prototype.test()。 如果想使用一个包含g修饰符的正则表达式匹配中获得捕获组,使用RegExp. prototype.exec()。 示例 直接...
In JavaScript, a regular expression text search, can be done with different methods. With apatternas a regular expression, these are the most common methods: ExampleDescription text.match(pattern)The String method match() text.search(pattern)The String method search() ...
javascript的正则表达式,基本用法可以参考这个 ;在会了基本用法后,有几个概念一定要注意,组、全局、RegExp.exec和String.match的区别。 全局 全局是标志是否全局匹配,通俗点说就是后一次匹配从上次匹配处往后匹配。比如 var reg = /.at/g; var str ="1at,2at,3at"; ...
JavaScript String 对象 match() 方法 match() 方法可在字符串内检索指定的值,或找到一个或多个正则表达式的匹配语法: stringObject.match(searchvalue) stringObject.match(regexp)
JavaScript String charAt() ThecharAt()method returns the character at a specified index (position) in a string: Example lettext ="HELLO WORLD"; letchar= text.charAt(0); Try it Yourself » JavaScript String charCodeAt() ThecharCodeAt()method returns the code of the character at a specified...
to see if it contains another string, there are two basic ways to do it. The first is to use 'indexOf' to find the position of the substring within the string. The second is to use 'match' or an equivalent method to find if a regular expression pattern can be found in the string...
Sample code from codecombat: var str = "For more information, see Chapter 3.4.5.1"; var re = /(chapter \d+(\.\d)*)/i; var found = str.match(re); console.log(String(found)); Code works fine in JS Console. Tested on both Chrome and FF with...