标签：表达 write 正则 str patt1 var 精炼 document match
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
</head>
<body>
<script>
// 正则表达式中的小括号"()"。是代表分组的意思。 如果再其后面出现\1则是代表与第一个小括号中要匹配的内容相同。
// \1必须与小括号配合使用
// /i 不区分大小写的匹配
var str = "Is is the cost of of gasoline going up up";
var patt1 = /\b([a-z]+) \1\b/ig;
document.write(str.match(patt1));
document.write("<br>");
</script>
<script>
var str = "aaaaacccccbbbbb";
var patt1 = /(\w)\1*/g;
document.write(str.match(patt1));
document.write("<br>");
</script>
<script>
var str = "aaaaacccccbbbbb";
var patt1 = /(\w)*/g;
document.write(str.match(patt1));
document.write("<br>");
</script>
<script>
var str = "aais accc is ccbb isb";
var patt1 = /\bis\b/;
document.write(str.match(patt1));
document.write("<br>");
</script>
<script>
var str = "aais a0737-5686123s ccbb isb";
var patt1 = /^0\d\d\d-\d\d\d\d\d\d\d$/;
document.write(str.match(patt1));
document.write("<br>");
</script>
<script>
var str = "a b c a b c a b c d d d d d d w e r ";
var patt1 = /\w[\w\s\w\s\w]/;
document.write(str.match(patt1));
document.write("<br>");
</script>
<script>
var str = "a b c a b c a b c d d d d d d w e r ";
var patt1 = /\w\s\w\s\w/;
document.write(str.match(patt1));
document.write("<br>");
</script>
</body>
</html>
标签：表达,
write,
正则,
str,
patt1,
var,
精炼,
document,
match
From： https://blog.51cto.com/u_15872025/5841613