标签:ref 单词 character blank 单个字符 oct png 元字符 www
元字符(Metacharacter)是拥有特殊含义的字符:
元字符 描述
(1) . 查找单个字符,除了换行和行结束符。
例子:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>点</title> </head> <body> <script type="text/javascript"> str=‘index and php 2 and Php and pHp 3 and indox and 20 indax and indBx andpcp and pp and p p and p-p and p\np and p9p‘; arr = str.match(/p.p/ig)//查找单个字符,除了换行和行结束符。 alert(arr); </script> </body> </html>
效果如图:
(2)\w 查找单词字符。
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>反斜线小写w查找单词字符</title> </head> <body> <script type="text/javascript"> str=‘index and php 2 and Php and pHp 3 and indox and 20 indax and indBx andpcp and pp and p p and p-p and p\np and p9p‘; arr = str.match(/p\wp/ig)//反斜线小写w查找单词字符 alert(arr); </script> </body> </html>
效果图:
(3) \W 查找非单词字符。
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>反斜线大写W查找非单词字符</title> </head> <body> <script type="text/javascript"> str=‘index and php 2 and Php and pHp 3 and indox and 20 indax and indBx andpcp and pp and p p and p-p and p\np and p9p‘; arr = str.match(/p\Wp/ig)//反斜线大写W查找非单词字符 alert(arr); </script> </body> </html>
效果图:
标签:ref 单词 character blank 单个字符 oct png 元字符 www
原文地址:http://www.cnblogs.com/huanghuali/p/7654504.html