Question

The regular expression ^[A-Za-z](\W|\w)* matches when the user gives the first letter as white space, and the first letter should not be a digit and remaining letters may be alpha numerical. When the user gives a white space as the first character it should automatically be trimmed. How?

Answer 1

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

Should do it. Just get group 1.

I’m not sure the language you are using, I’m going to assume 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.