一、用正则表达式写的简单的注册验证，具体要求如下：
用户注册验证（用户名，密码，昵称，中文名字，手机号，邮箱）所有信息符合以下条件才允许注册：
1.用户名格式：由字母数字下划线组成且开头必须是字母，不能超过16位；
2.密码格式：字母和数字构成，不能超过16位；
3.昵称：字母和数字构成长度大于6小于10；
4.手机号：全数字，长度为11位；
5.邮箱：必须包含@符号；必须包含点；点和@之间必须有字符；
所有信息符合上述条件才允许注册。
二、代码如下：
<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: "Source Code Pro", monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">package <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.lgl</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.day</span>02<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
import java<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.util</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.Scanner</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
import java<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.util</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.regex</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.Matcher</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
import java<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.util</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.regex</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.Pattern</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
public class StringCheck {
public static void main(String[] args) {
Pattern p = null<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
Matcher m = null<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
boolean flg = true<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
Scanner sc = new Scanner(System<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.in</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
System<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.out</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.println</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"------用户注册------"</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
//匹配用户名
System<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.out</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.println</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"用户名： ---（由字母数字下划线组成且开头必须是字母，不能超过16位）"</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
String name = sc<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.nextLine</span>()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
p = Pattern<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.compile</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"[a-zA-Z]{1}[a-zA-Z0-9_]{1,15}"</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
m = p<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.matcher</span>(name)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
flg = m<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.matches</span>()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
//匹配密码
System<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.out</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.println</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"密码：---（字母和数字构成，不能超过16位）"</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
String pass = sc<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.nextLine</span>()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
p = Pattern<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.compile</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"[a-zA-Z0-9]{1,16}"</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
m = p<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.matcher</span>(pass)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
flg = m<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.matches</span>()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
//匹配昵称
System<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.out</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.println</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"昵称： ---（字母和数字构成长度大于6小于10） "</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
String nicheng = sc<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.nextLine</span>()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
p = Pattern<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.compile</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"[a-zA-Z0-9]{7,9}"</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
m = p<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.matcher</span>(nicheng)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
flg = m<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.matches</span>()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
//匹配手机号
System<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.out</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.println</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"手机号： ---（全数字，长度为11位）"</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
String phone = sc<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.nextLine</span>()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
p = Pattern<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.compile</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"[0-9]{11}"</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
m = p<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.matcher</span>(phone)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
flg = m<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.matches</span>()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
//匹配邮箱
System<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.out</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.println</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"邮箱： ---（必须包含@符号；必须包含点；点和@之间必须有字符）"</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
String email = sc<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.nextLine</span>()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
p = Pattern<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.compile</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"[@]{1}[a-zA-Z0-9]+[.]+[a-z]+"</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
m = p<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.matcher</span>(email)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
flg = m<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.matches</span>()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
if(flg) {
System<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.out</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.println</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"注册成功"</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
} else {
System<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.out</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.println</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"信息填写不正确！"</span>)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
}
sc<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.close</span>()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
}
}</code>