知识点补充:
find()方法是部分匹配,是查找输入串中与模式匹配的子串,如果该匹配的串有组还可以使用group()函数。
matches()是全部匹配,是将整个输入串与模式匹配,如果要验证一个输入的数据是否为数字类型或其他类型,一般用matches()。
Pattern类的作用在于编译正则表达式后创建一个匹配模式。
Matcher类使用Pattern实例提供的模式信息对正则表达式进行匹配。
判断方法:
首先判断数据的长度是否符合ip长度,然后定义正则表达式,使用方法“compile”编译正则表达式并创建匹配模式,接着使用“matcher()”方法根据匹配模式进行匹配即可。
示例如下:
package com.you.dao; import java.util.regex.Matcher; import java.util.regex.Pattern; public class IpAddress { public static class IpAdd { public boolean isIP(String addr) { if(addr.length() < 7 || addr.length() > 15 || "".equals(addr)) { return false; } /** * 判断IP格式和范围 */ String rexp = "([1-9]|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])(\\.(\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])){3}"; Pattern pat = Pattern.compile(rexp); Matcher mat = pat.matcher(addr); boolean ipAddress = mat.find(); return ipAddress; } }
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