c#正则表达式验证身份证

身份证格式验证,以及15.18位互转方法

/// <summary>

/// 验证18位身份证格式

/// </summary>

/// <param name="cid"></param>

/// <returns>返回字符串,出错信息</returns>

public string CheckCidInfo18(string cid)

{

string[] aCity = new string[] { null, null, null, null, null, null, null, null, null, null, null, "北京", "天津", "河北", "山西", "内蒙古", null, null, null, null, null, "辽宁", "吉林", "黑龙江", null, null, null, null, null, null,
null, "上海", "江苏", "浙江", "安微", "福建", "江西", "山东", null, null, null, "河南", "湖北", "湖南", "广东", "广西", "海南", null, null, null, "重庆", "四川", "贵州", "云南", "西藏", null, null, null, null, null, null, "陕西", "甘肃", "青海", "宁夏", "新疆", null, null, null, null, null, "台湾", null,
null, null, null, null, null, null, null, null, "香港", "澳门", null, null, null, null, null, null, null, null, "国外" };

double iSum = 0;

System.Text.RegularExpressions.Regex rg = new System.Text.RegularExpressions.Regex(@"^\d{17}(\d|X|x)$");

System.Text.RegularExpressions.Match mc = rg.Match(cid);

if (!mc.Success)

{

return "- 您的身份证号码格式有误!";

}

cid = cid.ToLower();

cid = cid.Replace("x", "a");

if (aCity[int.Parse(cid.Substring(0, 2))] == null)

{

return "- 您的身份证号码格式有误!";//非法地区

}

try

{

DateTime.Parse(cid.Substring(6, 4) + "-" + cid.Substring(10, 2) + "-" + cid.Substring(12, 2));

}

catch

{

return "- 您的身份证号码格式有误!";//非法生日

}

for (int i = 17; i >= 0; i--)

{

iSum += (System.Math.Pow(2, i) % 11) * int.Parse(cid[17 - i].ToString(), System.Globalization.NumberStyles.HexNumber);

}

if (iSum % 11 != 1)

return ("- 您的身份证号码格式有误!");//非法证号

return "";

}

/// <summary>

/// 验证15位身份证格式

/// </summary>

/// <param name="cid"></param>

/// <returns></returns>

public string CheckCidInfo15(string cid)

{

string[] aCity = new string[] { null, null, null, null, null, null, null, null, null, null, null, "北京", "天津", "河北", "山西", "内蒙古", null, null, null, null, null, "辽宁", "吉林", "黑龙江", null, null, null, null, null, null,
null, "上海", "江苏", "浙江", "安微", "福建", "江西", "山东", null, null, null, "河南", "湖北", "湖南", "广东", "广西", "海南", null, null, null, "重庆", "四川", "贵州", "云南", "西藏", null, null, null, null, null, null, "陕西", "甘肃", "青海", "宁夏", "新疆", null, null, null, null, null, "台湾", null,
null, null, null, null, null, null, null, null, "香港", "澳门", null, null, null, null, null, null, null, null, "国外" };

System.Text.RegularExpressions.Regex rg = new System.Text.RegularExpressions.Regex(@"^\d{15}$");

System.Text.RegularExpressions.Match mc = rg.Match(cid);

if (!mc.Success)

{

return "- 您的身份证号码格式有误!";

}

cid = cid.ToLower();

cid = cid.Replace("x", "a");

if (int.Parse(cid.Substring(0, 2)) > aCity.Length)

{

return "- 您的身份证号码格式有误!";//非法地区

}

if (aCity[int.Parse(cid.Substring(0, 2))] == null)

{

return "- 您的身份证号码格式有误!";//非法地区

}

try

{

DateTime.Parse(cid.Substring(6, 2) + "-" + cid.Substring(8, 2) + "-" + cid.Substring(10, 2));

}

catch

{

return "- 您的身份证号码格式有误!";//非法生日

}

return "";

}

/// <summary>

/// 15位转18位身份证号

/// </summary>

/// <param name="perIDSrc"></param>

/// <returns></returns>

public string per15To18(string perIDSrc)

{

int iS = 0;

//加权因子常数

int[] iW = new int[] { 7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2 };

//校验码常数

string LastCode = "10X98765432";

//新身份证号

string perIDNew;

perIDNew = perIDSrc.Substring(0, 6);

//填在第6位及第7位上填上‘1’，‘9’两个数字

perIDNew += "19";

perIDNew += perIDSrc.Substring(6, 9);

//进行加权求和

for (int i = 0; i < 17; i++)

{

iS += int.Parse(perIDNew.Substring(i, 1)) * iW[i];

}

//取模运算，得到模值

int iY = iS % 11;

//从LastCode中取得以模为索引号的值，加到身份证的最后一位，即为新身份证号。

perIDNew += LastCode.Substring(iY, 1);

return perIDNew;

}

/// <summary>

/// 18位转15位身份证号

/// </summary>

/// <param name="perIDSrc"></param>

/// <returns></returns>

public string per18To15(string perIDSrc)

{

//前6位

string str1 = perIDSrc.Substring(0, 6);

//后9位

string str2 = perIDSrc.Substring(8, 9);

//新字符串

string perIDNew = str1 + str2;

return perIDNew;

}