C # code implementation mailbox validation in C # and some common regular expressions

      1. Verify the user name and password: ("^[a-za-z]\w{5,15}$") Correct format:"[a-z][a-z]_[0-9]"And the first word must be a letter 6~16 bits;2. Verify your phone number: ("^ (\d{3.4}-) \d{7,8}$") Correct format: xxx/xxxx-xxxxxxx/xxxxxxxx;3. Verify the Social Security number (15-bit or 18-digit number): ("^\d{15}|\d{18}$");4. Verify Email Address: ("^\w+ ([-+.] \w+) *@\w+ ([-.] \w+) *\.\w+ ([-.] \w+) *$");5Only a string consisting of a number and 26 English letters can be entered: ("^[a-za-z0-9]+$") ; 6. Integer or decimal: ^[0-9]+\. {0,1}[0-9]{0,2}$7. Only numbers can be entered:"^[0-9]*$". 8Only n digits can be entered:"^\d{n}$". 9Only numbers with at least n digits can be entered:"^\d{n,}$". TenOnly the number of m~n digits can be entered:."^\d{m,n}$" 　　  OneOnly numbers starting with 0 and non-0 can be entered:"^ (0|[ 1-9][0-9]*) $".  AOnly positive numbers with two decimal places can be entered:"^[0-9]+ (. [ 0-9]{2})? $".  -Only positive numbers with a decimal position can be entered:"^[0-9]+ (. [ 0-9]{1,3})? $".  -Only a non-zero positive integer can be entered:"^\+? [1-9] [0-9]*$".  theOnly a non-zero negative integer can be entered:"^\-[1-9][]0-9"*$.  -Only characters with a length of 3 can be entered:"^. {3}$".  -You can only enter a string consisting of 26 English letters:"^[a-za-z]+$".  -You can only enter a string consisting of 26 uppercase English letters:"^[a-z]+$".  +You can only enter a string consisting of 26 lowercase English letters:"^[a-z]+$".  -. Verify that the ^%& is included',; =?$\ "and other characters:" [^%&',; =?$\x22]+".  　　  +. Only Chinese characters can be entered:"^[\u4e00-\u9fa5]{0,}$" 　　  A. Verify the URL:"^http://([\w-]+\.) +[\w-]+ (/[\w-./?%&=]*)? $".  at. Validation 12 months of the year:"^ (0?[ 1-9]|1[0-2]) $"The correct format is:" on"~" the"And"1"~" A".  -. Verify one months of 31 days:"^ ((0?[ 1-9]) | ((1|2) [0-9]) |30|31) $"The correct format is;" on"~" the"And"1"~" to"。

C # code implementation mailbox validation in C # and some common regular expressions