^[A-Za-z](\W|\w)* regular expression?

Question

the above expression is raise when user give first letter as white space and first letter should not be a digit and remaining letters may alpha numerical. i need when user give white space as a first character automatically it should trimed i need that one can u help me thank u

Answer 1

^\s*([A-Za-z]\w*)

Should do it. Just get group 1.

I'm not sure the language you are using since the question was tagged Asp.Net and C, I'm going to assume you ment C#, so here is a C# sample:

string testString = "       myMatch123 not in the match";

Regex regexObj = new Regex("^\\s*([A-Za-z]\\w*)", 
                        RegexOptions.IgnoreCase | RegexOptions.Multiline);
string result = regexObj.Match(testString).Groups[1].Value;

Console.WriteLine("-" + result + "-");

This will print

-myMatch123-

To the console window.

Answer 2

Is it possible to Trim() your input before giving it to your regex?

If you're looking for alpha-numerical, starting with non-numeric, you probably want:

\s*([A-Za-z][A-Za-z0-9]+)

If you allow one-character user names, change that plus to a star.