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180 lines
6.0 KiB
180 lines
6.0 KiB
13 years ago
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'\" t
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.TH QRegExpValidator 3qt "2 February 2007" "Trolltech AS" \" -*- nroff -*-
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.\" Copyright 1992-2007 Trolltech ASA. All rights reserved. See the
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.\" license file included in the distribution for a complete license
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.\" statement.
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.\"
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.ad l
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.nh
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.SH NAME
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QRegExpValidator \- Used to check a string against a
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.SH SYNOPSIS
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\fC#include <qvalidator.h>\fR
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.PP
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Inherits QValidator.
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.PP
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.SS "Public Members"
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.in +1c
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.ti -1c
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.BI "\fBQRegExpValidator\fR ( QObject * parent, const char * name = 0 )"
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.br
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.ti -1c
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.BI "\fBQRegExpValidator\fR ( const QRegExp & rx, QObject * parent, const char * name = 0 )"
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.br
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.ti -1c
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.BI "\fB~QRegExpValidator\fR ()"
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.br
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.ti -1c
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.BI "virtual QValidator::State \fBvalidate\fR ( QString & input, int & pos ) const"
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.br
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.ti -1c
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.BI "void \fBsetRegExp\fR ( const QRegExp & rx )"
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.br
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.ti -1c
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.BI "const QRegExp & \fBregExp\fR () const"
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.br
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.in -1c
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.SH DESCRIPTION
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The QRegExpValidator class is used to check a string against a regular expression.
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.PP
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QRegExpValidator contains a regular expression, "regexp", used to determine whether an input string is Acceptable, Intermediate or Invalid.
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.PP
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The regexp is treated as if it begins with the start of string assertion, \fB^\fR, and ends with the end of string assertion \fB$\fR so the match is against the entire input string, or from the given position if a start position greater than zero is given.
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.PP
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For a brief introduction to Qt's regexp engine see QRegExp.
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.PP
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Example of use:
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.PP
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.nf
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.br
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// regexp: optional '-' followed by between 1 and 3 digits
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.br
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QRegExp rx( "-?\\\\d{1,3}" );
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.br
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QValidator* validator = new QRegExpValidator( rx, this );
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.br
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.br
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QLineEdit* edit = new QLineEdit( this );
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.br
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edit->setValidator( validator );
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.br
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.fi
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.PP
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Below we present some examples of validators. In practice they would normally be associated with a widget as in the example above.
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.PP
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.nf
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.br
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// integers 1 to 9999
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.br
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QRegExp rx( "[1-9]\\\\d{0,3}" );
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.br
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// the validator treats the regexp as "^[1-9]\\\\d{0,3}$"
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.br
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QRegExpValidator v( rx, 0 );
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.br
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QString s;
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.br
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int pos = 0;
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.br
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.br
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s = "0"; v.validate( s, pos ); // returns Invalid
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.br
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s = "12345"; v.validate( s, pos ); // returns Invalid
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.br
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s = "1"; v.validate( s, pos ); // returns Acceptable
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.br
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.br
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rx.setPattern( "\\\\S+" ); // one or more non-whitespace characters
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.br
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v.setRegExp( rx );
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.br
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s = "myfile.txt"; v.validate( s, pos ); // Returns Acceptable
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.br
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s = "my file.txt"; v.validate( s, pos ); // Returns Invalid
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.br
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.br
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// A, B or C followed by exactly five digits followed by W, X, Y or Z
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.br
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rx.setPattern( "[A-C]\\\\d{5}[W-Z]" );
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.br
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v.setRegExp( rx );
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.br
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s = "a12345Z"; v.validate( s, pos ); // Returns Invalid
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.br
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s = "A12345Z"; v.validate( s, pos ); // Returns Acceptable
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.br
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s = "B12"; v.validate( s, pos ); // Returns Intermediate
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.br
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.br
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// match most 'readme' files
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.br
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rx.setPattern( "read\\\\S?me(\\.(txt|asc|1st))?" );
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.br
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rx.setCaseSensitive( FALSE );
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.br
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v.setRegExp( rx );
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.br
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s = "readme"; v.validate( s, pos ); // Returns Acceptable
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.br
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s = "README.1ST"; v.validate( s, pos ); // Returns Acceptable
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.br
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s = "read me.txt"; v.validate( s, pos ); // Returns Invalid
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.br
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s = "readm"; v.validate( s, pos ); // Returns Intermediate
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.br
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.fi
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.PP
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See also QRegExp, QIntValidator, QDoubleValidator, and Miscellaneous Classes.
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.SH MEMBER FUNCTION DOCUMENTATION
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.SH "QRegExpValidator::QRegExpValidator ( QObject * parent, const char * name = 0 )"
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Constructs a validator that accepts any string (including an empty one) as valid. The object's parent is \fIparent\fR and its name is \fIname\fR.
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.SH "QRegExpValidator::QRegExpValidator ( const QRegExp & rx, QObject * parent, const char * name = 0 )"
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Constructs a validator which accepts all strings that match the regular expression \fIrx\fR. The object's parent is \fIparent\fR and its name is \fIname\fR.
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.PP
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The match is made against the entire string, e.g. if the regexp is \fB[A-Fa-f0-9]+\fR it will be treated as \fB^[A-Fa-f0-9]+$\fR.
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.SH "QRegExpValidator::~QRegExpValidator ()"
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Destroys the validator, freeing any resources allocated.
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.SH "const QRegExp & QRegExpValidator::regExp () const"
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Returns the regular expression used for validation.
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.PP
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See also setRegExp().
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.SH "void QRegExpValidator::setRegExp ( const QRegExp & rx )"
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Sets the regular expression used for validation to \fIrx\fR.
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.PP
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See also regExp().
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.SH "QValidator::State QRegExpValidator::validate ( QString & input, int & pos ) const\fC [virtual]\fR"
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Returns Acceptable if \fIinput\fR is matched by the regular expression for this validator, Intermediate if it has matched partially (i.e. could be a valid match if additional valid characters are added), and Invalid if \fIinput\fR is not matched.
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.PP
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The \fIpos\fR parameter is set to the length of the \fIinput\fR parameter.
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.PP
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For example, if the regular expression is \fB\w\d\d\fR (that is, word-character, digit, digit) then "A57" is Acceptable," E5" is Intermediate and "+9" is Invalid.
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.PP
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See also QRegExp::match() and QRegExp::search().
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.PP
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Reimplemented from QValidator.
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.SH "SEE ALSO"
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.BR http://doc.trolltech.com/qregexpvalidator.html
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.BR http://www.trolltech.com/faq/tech.html
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.SH COPYRIGHT
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Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com. See the
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license file included in the distribution for a complete license
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statement.
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.SH AUTHOR
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Generated automatically from the source code.
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.SH BUGS
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If you find a bug in Qt, please report it as described in
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.BR http://doc.trolltech.com/bughowto.html .
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Good bug reports help us to help you. Thank you.
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.P
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The definitive Qt documentation is provided in HTML format; it is
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located at $QTDIR/doc/html and can be read using Qt Assistant or with
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a web browser. This man page is provided as a convenience for those
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users who prefer man pages, although this format is not officially
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supported by Trolltech.
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.P
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If you find errors in this manual page, please report them to
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.BR qt-bugs@trolltech.com .
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Please include the name of the manual page (qregexpvalidator.3qt) and the Qt
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version (3.3.8).
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