<!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>
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