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+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+** * Redistributions of source code must retain the above copyright
+** notice, this list of conditions and the following disclaimer.
+** * Redistributions in binary form must reproduce the above copyright
+** notice, this list of conditions and the following disclaimer in
+** the documentation and/or other materials provided with the
+** distribution.
+** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
+** the names of its contributors may be used to endorse or promote
+** products derived from this software without specific prior written
+** permission.
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//! [0]
+QValidator *validator = new QIntValidator(100, 999, this);
+QLineEdit *edit = new QLineEdit(this);
+
+// the edit lineedit will only accept integers between 100 and 999
+edit->setValidator(validator);
+//! [0]
+
+
+//! [1]
+QString str;
+int pos = 0;
+QIntValidator v(100, 900, this);
+
+str = "1";
+v.validate(str, pos); // returns Intermediate
+str = "012";
+v.validate(str, pos); // returns Intermediate
+
+str = "123";
+v.validate(str, pos); // returns Acceptable
+str = "678";
+v.validate(str, pos); // returns Acceptable
+
+str = "999";
+v.validate(str, pos); // returns Intermediate
+
+str = "1234";
+v.validate(str, pos); // returns Invalid
+str = "-123";
+v.validate(str, pos); // returns Invalid
+str = "abc";
+v.validate(str, pos); // returns Invalid
+str = "12cm";
+v.validate(str, pos); // returns Invalid
+//! [1]
+
+
+//! [2]
+int pos = 0;
+
+s = "abc";
+v.validate(s, pos); // returns Invalid
+
+s = "5";
+v.validate(s, pos); // returns Intermediate
+
+s = "50";
+v.validate(s, pos); // returns Acceptable
+//! [2]
+
+
+//! [3]
+// regexp: optional '-' followed by between 1 and 3 digits
+QRegExp rx("-?\\d{1,3}");
+QValidator *validator = new QRegExpValidator(rx, this);
+
+QLineEdit *edit = new QLineEdit(this);
+edit->setValidator(validator);
+//! [3]
+
+
+//! [4]
+// integers 1 to 9999
+QRegExp rx("[1-9]\\d{0,3}");
+// the validator treats the regexp as "^[1-9]\\d{0,3}$"
+QRegExpValidator v(rx, 0);
+QString s;
+int pos = 0;
+
+s = "0"; v.validate(s, pos); // returns Invalid
+s = "12345"; v.validate(s, pos); // returns Invalid
+s = "1"; v.validate(s, pos); // returns Acceptable
+
+rx.setPattern("\\S+"); // one or more non-whitespace characters
+v.setRegExp(rx);
+s = "myfile.txt"; v.validate(s, pos); // Returns Acceptable
+s = "my file.txt"; v.validate(s, pos); // Returns Invalid
+
+// A, B or C followed by exactly five digits followed by W, X, Y or Z
+rx.setPattern("[A-C]\\d{5}[W-Z]");
+v.setRegExp(rx);
+s = "a12345Z"; v.validate(s, pos); // Returns Invalid
+s = "A12345Z"; v.validate(s, pos); // Returns Acceptable
+s = "B12"; v.validate(s, pos); // Returns Intermediate
+
+// match most 'readme' files
+rx.setPattern("read\\S?me(\.(txt|asc|1st))?");
+rx.setCaseSensitive(false);
+v.setRegExp(rx);
+s = "readme"; v.validate(s, pos); // Returns Acceptable
+s = "README.1ST"; v.validate(s, pos); // Returns Acceptable
+s = "read me.txt"; v.validate(s, pos); // Returns Invalid
+s = "readm"; v.validate(s, pos); // Returns Intermediate
+//! [4]