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public static bool isUsernameValid(string username) { RegEx r = new Regex(“^[A-Za-z0-9]{16}$”); return r.isMatch(username); } // java.sql.Connection conn is set elsewhere for brevity. PreparedStatement ps = null; RecordSet rs = null; try { pUserName = request.getParameter(“UserName”); if ( isUsernameValid (pUsername); ps = conn.prepareStatement(“SELECT * FROM user_table WHERE username = ? ”); ps.setString(1, pUsername); rs = ps.execute(); if ( rs.next() ) { // do the work of making the user record active in some way } } else { // handle invalid input } } catch (…) { // handle all exceptions … }

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