public static string xxRemoveDot(string pTarget) { string rStr = ""; string pattern = "^[a-zA-Z0-9]{1}$"; int j, num = pTarget.Length; for (j = 0; j < num; j++) { string cur = pTarget.Substring(j, 1); if (AgUtil.CheckNickValidWithPattern(cur, pattern)) { rStr += cur; } } return(rStr); }