js如何使用正则表达式
1、replace()替换目标字符串,在一个长串中替换子串为另外一个字符串。代码如下:<!DOCTYPE html><html><head><m髫潋啜缅eta charset="utf-8"><title>Test re in js</title></head><body><p>repalce String:"js"</p><p>Where is the js!</p><p id="position"></p><button onclick="myFunction()">Search</button><script>function myFunction() { var str="Where is the js!"; var target="js"; var pattern="baidu"; var pos=str.replace(target,pattern); document.getElementById("position").innerHTML=pos;}</script></body></html>



3、test()用于测试模式串是否存在于目标字腿发滏呸符串中,是返回true,否返回false代码如下:<!DOCTYPE html><html><head媪青怍牙><meta charset="utf-8"><title>Test re in js</title></head><body><p>Is :"js" in the text behind.</p><p>Where is the js!</p><p id="position"></p><button onclick="myFunction()">Search</button><script>function myFunction() { var str="Where is the js!"; var pattern=/js/; var result=pattern.test(str); document.getElementById("position").innerHTML=result;}</script></body></html>


