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+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the documentation of Qt for Python.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, 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 The Qt Company Ltd 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]
+validator = QIntValidator(100, 999, self)
+edit = QLineEdit(self)
+
+# the edit lineedit will only accept integers between 100 and 999
+edit.setValidator(validator)
+//! [0]
+
+
+//! [1]
+pos = 0
+v = QIntValidator(100, 900, self)
+
+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]
+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
+rx = QRegExp("-?\\d{1,3}")
+validator = QRegExpValidator(rx, self)
+
+edit = QLineEdit(self)
+edit.setValidator(validator)
+//! [3]
+
+
+//! [4]
+# integers 1 to 9999
+rx = QRegExp("[1-9]\\d{0,3}")
+# the validator treats the regexp as "^[1-9]\\d{0,3}$"
+v = QRegExpValidator(rx, 0)
+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]