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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?
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The bracketed characters [a-zA-Z0-9] mean that any letter (regardless of case) or digit will match. The * (asterisk) following the brackets indicates that the bracketed characters occur 0 or more times.
[a-zA-Z0-9. _-:\?] means it can be among the all the Uppercase and lowercase letters and the number betwween 0 and 9, and the letter.
[] denotes a character class. () denotes a capturing group. [a-z0-9] -- One character that is in the range of a-z OR 0-9. (a-z0-9) -- Explicit capture of a-z0-9 .
For example [a-zA-Z0-9]+ is a pattern that matches against a string of any length, as long as the string contains only lowercase letters ( a-z ), uppercase letters ( A-Z ), or numerals ( 0-9 ).
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).
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