正则表达式用于字符串处理、表单验证等场合,实用高效。现将一些常用的表达式收集于此,以备不时之需。
匹配中文字符的正则表达式: [\u4e00-\u9fa5]
评注:匹配中文还真是个头疼的事,有了这个表达式就好办了
匹配双字节字符(包括汉字在内):[^\x00-\xff]
评注:可以用来计算字符串的长度(一个双字节字符长度计2,ASCII字符计1)
匹配空白行的正则表达式:\n\s*\r
评注:可以用来删除空白行
匹配HTML标记的正则表达式:<(\S*?)[^>]*>.*?</\1>|<.*? />
评注:网上流传的版本太糟糕,上面这个也仅仅能匹配部分,对于复杂的嵌套标记依旧无能为力
匹配首尾空白字符的正则表达式:^\s*|\s*$
评注:可以用来删除行首行尾的空白字符(包括空格、制表符、换页符等等),非常有用的表达式
匹配Email地址的正则表达式:\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*
评注:表单验证时很实用
匹配网址URL的正则表达式:[a-zA-z]+://[^\s]*
评注:网上流传的版本功能很有限,上面这个基本可以满足需求
匹配帐号是否合法(字母开头,允许5-16字节,允许字母数字下划线):^[a-zA-Z][a-zA-Z0-9_]{4,15}$
评注:表单验证时很实用
匹配国内电话号码:\d{3}-\d{8}|\d{4}-\d{7}
评注:匹配形式如 0511-4405222 或 021-87888822
匹配腾讯QQ号:[1-9][0-9]{4,}
评注:腾讯QQ号从10000开始
匹配中国邮政编码:[1-9]\d{5}(?!\d)
评注:中国邮政编码为6位数字
匹配身份证:\d{15}|\d{18}
评注:中国的身份证为15位或18位
匹配ip地址:\d+\.\d+\.\d+\.\d+
评注:提取ip地址时有用
匹配特定数字:
^[1-9]\d*$ //匹配正整数
^-[1-9]\d*$ //匹配负整数
^-?[1-9]\d*$ //匹配整数
^[1-9]\d*|0$ //匹配非负整数(正整数 + 0)
^-[1-9]\d*|0$ //匹配非正整数(负整数 + 0)
^[1-9]\d*\.\d*|0\.\d*[1-9]\d*$ //匹配正浮点数
^-([1-9]\d*\.\d*|0\.\d*[1-9]\d*)$ //匹配负浮点数
^-?([1-9]\d*\.\d*|0\.\d*[1-9]\d*|0?\.0+|0)$ //匹配浮点数
^[1-9]\d*\.\d*|0\.\d*[1-9]\d*|0?\.0+|0$ //匹配非负浮点数(正浮点数 + 0)
^(-([1-9]\d*\.\d*|0\.\d*[1-9]\d*))|0?\.0+|0$ //匹配非正浮点数(负浮点数 + 0)
评注:处理大量数据时有用,具体应用时注意修正
匹配特定字符串:
^[A-Za-z]+$ //匹配由26个英文字母组成的字符串
^[A-Z]+$ //匹配由26个英文字母的大写组成的字符串
^[a-z]+$ //匹配由26个英文字母的小写组成的字符串
^[A-Za-z0-9]+$ //匹配由数字和26个英文字母组成的字符串
^\w+$ //匹配由数字、26个英文字母或者下划线组成的字符串
评注:最基本也是最常用的一些表达式
下面是我项目中一个正则表达式类
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
Code
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public class Common
2![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
{
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//private const string REG_DATE = @"^(\d{2}|\d{4})[\-\/]((0?[1-9])|(1[0-2]))[\-\/]((0?[1-9])|((1|2)[0-9])|30|31)$";
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private const string REG_DATE = @"^(\d{2}|\d{4})((0[1-9])|(1[0-2]))((0[1-9])|((1|2)[0-9])|30|31)$";
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private const string REG_PHONE = @"^((0[0-9]{2,3}){0,1}([0-9]{7,8}))$";
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private const string REG_EMAIL = @"^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$";
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private const string REG_MOBILE = @"(^0{0,1}13[0-9]{9}$)";
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private const string REG_IDCARD = @"^([0-9]{14}|[0-9]{17})(x|[0-9]){1}$";
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private const string REG_TIME = @"^((([0-1]?[0-9])|(2[0-3]))([\:])([0-5][0-9]))$";
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private const string REG_TIME1 = @"^((([0-1][0-9])|(2[0-3])):[0-5]\d:[0-5]\d)$";
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private const string REG_DATA1 = @"^((\d{2}(([02468][048])|([13579][26]))[\-\/\s]((((0?[13578])|(1[02]))[\-\/\s]((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))[\-\/\s]((0?[1-9])|([1-2][0-9])|(30)))|(0?2[\-\/\s]((0?[1-9])|([1-2][0-9])))))|(\d{2}(([02468][1235679])|([13579][01345789]))[\-\/\s]((((0?[13578])|(1[02]))[\-\/\s]((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))[\-\/\s]((0?[1-9])|([1-2][0-9])|(30)))|(0?2[\-\/\s]((0?[1-9])|(1[0-9])|(2[0-8]))))))$";
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private const string REG_SHUZI = @"^\d+$";
13![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
14![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
半角验证#region 半角验证
15![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//// <summary>
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/// 半角验证
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/// </summary>
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/// <param name="str">验证的字符串</param>
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/// <returns></returns>
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public static bool IsDBC(string str)
21![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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UTF8Encoding encoding = new UTF8Encoding();
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int byteCount = encoding.GetByteCount(str);
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int strLen = str.Length;
25![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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if (strLen == byteCount)
27![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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return true;
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}
30![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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return false;
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}
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#endregion
34![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
35![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
全角验证#region 全角验证
36![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//// <summary>
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/// 全角验证
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/// </summary>
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/// <param name="str">验证的字符串</param>
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/// <returns></returns>
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public static bool IsSBC(string str)
42![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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UTF8Encoding encoding = new UTF8Encoding();
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int byteCount = encoding.GetByteCount(str);
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int strLen = str.Length;
46![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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if (byteCount == strLen * 3)
48![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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return true;
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}
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return false;
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}
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#endregion
55![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
56![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
57![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
时间1字符串有效性验证#region 时间1字符串有效性验证
58![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//// <summary>
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/// 时间1字符串有效性验证
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/// </summary>hh:mm:ss
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/// <param name="date">日期字符串</param>
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/// <returns>有效:true,否则:false</returns>
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public static bool IsValidTime1(string time1)
64![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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return Regex.IsMatch(time1, Common.REG_TIME1);
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}
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#endregion
68![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
69![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
日期1字符串有效性验证#region 日期1字符串有效性验证
70![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//// <summary>
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/// 日期字符串有效性验证yyyy-mm-dd
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/// </summary>
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/// <param name="date">日期字符串</param>
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/// <returns>有效:true,否则:false</returns>
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public static bool IsValidDate1(string date1)
76![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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return Regex.IsMatch(date1, Common.REG_DATA1);
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}
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#endregion
80![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
81![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
82![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
日期字符串有效性验证#region 日期字符串有效性验证
83![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//// <summary>
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/// 日期字符串有效性验证
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/// </summary>
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/// <param name="date">日期字符串</param>
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/// <returns>有效:true,否则:false</returns>
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public static bool IsValidDate(string date)
89![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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return Regex.IsMatch(date, Common.REG_DATE);
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}
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#endregion
93![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
94![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
Email有效性验证#region Email有效性验证
95![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//// <summary>
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/// Email有效性验证
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/// </summary>
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/// <param name="email">Email字符串</param>
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/// <returns>有效:true,否则:false</returns>
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public static bool IsValidEmail(string email)
101![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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return Regex.IsMatch(email, Common.REG_EMAIL);
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}
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#endregion
105![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
106![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
电话号码有效性验证#region 电话号码有效性验证
107![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//// <summary>
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/// 电话号码有效性验证
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/// </summary>
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/// <param name="phone">电话号码字符串</param>
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/// <returns>有效:true,否则:false</returns>
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public static bool IsVaildPhone(string phone)
113![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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return Regex.IsMatch(phone, Common.REG_PHONE);
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}
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#endregion
117![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
118![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
手机号码有效性验证#region 手机号码有效性验证
119![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//// <summary>
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/// 手机号码有效性验证
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/// </summary>
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/// <param name="mobile">手机号码字符串</param>
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/// <returns>有效:true,否则:false</returns>
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public static bool IsValidMobile(string mobile)
125![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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return Regex.IsMatch(mobile, REG_MOBILE);
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}
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#endregion
129![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
130![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
身份证号有效性验证#region 身份证号有效性验证
131![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//// <summary>
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/// 身份证号有效性验证
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/// </summary>
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/// <param name="idCard">身份证号字符串</param>
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/// <returns>有效:true,否则:false</returns>
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public static bool IsValidIdCard(string idCard)
137![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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return Regex.IsMatch(idCard, Common.REG_IDCARD);
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}
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#endregion
141![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
142![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
日期字符串转换成日期对象#region 日期字符串转换成日期对象
143![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//// <summary>
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/// 日期字符串转换成日期对象
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/// </summary>
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/// <param name="date">日期字符串</param>
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/// <returns>日期对象</returns>
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public static DateTime CastDateTime(string date)
149![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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StringBuilder builder = new StringBuilder();
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builder.Append(date.Substring(0, 4));
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builder.Append("-");
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builder.Append(date.Substring(4, 2));
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builder.Append("-");
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builder.Append(date.Substring(6, 2));
156![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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return Convert.ToDateTime(builder.ToString());
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}
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#endregion
160![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
161![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
日期对象转化成日期字符串#region 日期对象转化成日期字符串
162![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//// <summary>
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/// 日期对象转化成日期字符串
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/// </summary>
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/// <param name="date">日期对象</param>
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/// <returns>日期字符串</returns>
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public static string CastDateTime(DateTime date)
168![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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string strDate = date.ToString("yyyy-MM-dd");
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strDate = strDate.Replace("-", "");
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return strDate;
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}
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#endregion
174![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
175![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
时间格式验证#region 时间格式验证
176![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//// <summary>
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/// 时间格式验证
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/// </summary>
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/// <param name="time">时间字符串</param>
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/// <returns>正确:true,错误:false</returns>
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public static bool IsValidTime(string time)
182![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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return Regex.IsMatch(time, REG_TIME);
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}
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#endregion
186![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
187![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
数字验证#region 数字验证
188![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//// <summary>
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/// 数字验证
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/// </summary>
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/// <returns>正确:true,错误:false</returns>
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public static bool IsValidSHUZI(string shuzi)
193![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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return Regex.IsMatch(shuzi, REG_SHUZI);
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}
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#endregion
197![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
198![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
年龄校验#region 年龄校验
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public static bool IsAges(string str)
200![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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System.Text.RegularExpressions.Regex reg1 = new System.Text.RegularExpressions.Regex(@"^\d+$");
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if (reg1.IsMatch(str))
203![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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if (Convert.ToInt32(str.Trim()) > 18 && Convert.ToInt32(str.Trim()) <= 100)
205![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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return true;
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}
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else
209![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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return false;
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}
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}
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else
214![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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return false;
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}
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}
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#endregion
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}
220![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)