A-Za-Z A-Za-z0-9 regular expression

Question

The regular expression   A-Za-Z   A-Za-z0-9    describe  first letter should be alphabet and remaining letter may be alpha numerical   But how do I also allow special characters   When I enter  C   it is raising an error   How do I enter a special character and first letter should alphabet

User · Answer

How about    A-Za-z  S    a letter followed by 0 or more non-space characters  will include all special symbols

User · Answer

First must be Alphabet and then dot not allowed in target string  below is code           string input    A aaA               B            The regular expression we use to match         Regex r1   new Regex    A-Za-z               t 0x0020  tab and spaces              C            Match the input and write results         Match match   r1 Match input           if  match Success                        Console WriteLine  Valid   0    match Value                      else                       Console WriteLine  Not Match                        Console ReadLine

User · Answer

This expression will force the first letter to be alphabetic and the remaining characters to be alphanumeric or any of the following special characters         amp       A-Za-z  A-Za-z0-9    amp

User · Answer

Try this     A-Za-z

User · Answer

A-Za-z   W  w       W  w  will ensure that every subsequent letter is word  w  or non word  W   instead of   W  w   you can also use    where   means absolutely anything just like   w  W

User · Answer

this expression is to get only numbers     If Regex IsMatch mystring   quot   A-Za-z      s quot   Then         MessageBox Show  quot please fill the box quot    quot Error quot   MessageBoxButtons OK  MessageBoxIcon Warning              ElseIf  mystring    quot  quot   Then         MessageBox Show  quot please fill the box quot    quot Error quot   MessageBoxButtons OK  MessageBoxIcon Warning             End If

User · Answer

This expression will check if the first letter to be alphabetic and the remaining characters to be alphanumeric or any of the following special characters         amp      A-Za-z  A-Za-z0-9    amp

User · Answer

A lot of the answers given so far are pretty good  but you must clearly define what it is exactly that you want   If you would like a alphabetical character followed by any number of non-white-space characters  note that it would also include numbers   then you should use this     A-Za-z  S    If you would like to include only alpha-numeric characters and certain symbols  then use this     A-Za-z  A-Za-z0-9             Your original question looks like you are trying to include the space character as well  so you probably want something like this     A-Za-z   A-Za-z0-9              And that is my final answer   I suggest taking some time to learn more about regular expressions  They are the greatest thing since sliced bread   Try this syntax reference page  that site in general is very good

[c#] ^[A-Za-Z ][A-Za-z0-9 ]* regular expression?

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