摘要：
1. 正则表达式email:=~ /^([0-9a-zA-Z]{3,}|[0-9a-zA-Z]+(-|_)?[0-9a-zA-Z_-]+\.?[0-9a-zA-Z]+)\@[0-9a-zA-Z]+\.[0-9a-zA-Z]+(\.\w+)?/;ip =~/([0-9]{1,3}\.?){4}/;. Match any character except a wrap character.\w Match "word" character and [_0-9a-zA-Z]\WMatch non-word character [^_0-9a-zA-Z]\s Match white 阅读全文