[username] where username is any string containing only alphanumeric chars between 1 and 12 characters long
My code:
Regex pat = new Regex(@"\[[a-zA-Z0-9_]{1,12}\]");
MatchCollection matches = pat.Matches(accountFileData);
foreach (Match m in matches)
{
string username = m.Value.Replace("[", "").Replace("]", "");
MessageBox.Show(username);
}
Gives me one blank match
This gets you a name inside brackets (the match does't contain the square brackets symbol):
(?<=\[)[A-Za-z0-9]{1,12}(?=\])
You could use it like:
Regex pat = new Regex(@"(?<=\[)[A-Za-z0-9]{1,12}(?=\])");
MatchCollection matches = pat.Matches(accountFileData);
foreach (Match m in matches)
{
MessageBox.Show(m.Value);
}
You have too many brackets, and you may want to match the beginning (^) and end ($) of the string.
^[a-zA-Z0-9]{1,12}$
If you are expecting square brackets in the string you are matching, then escape them with a backslash.
\[[a-zA-Z0-9]{1,12}\]
// In C#
new Regex(@"\[[a-zA-Z0-9]{1,12}\]")
You have too many brackets.
[a-zA-Z0-9]{1, 12}
If you're trying to match the brackets, they need to be escaped properly:
\[[a-zA-Z0-9]{1, 12}\]
