QRegExpValidator(3qt)													     QRegExpValidator(3qt)

NAME

       QRegExpValidator - Used to check a string against a

SYNOPSIS

       #include <qvalidator.h>

       Inherits QValidator.

   Public Members
       QRegExpValidator ( QObject * parent, const char * name = 0 )
       QRegExpValidator ( const QRegExp & rx, QObject * parent, const char * name = 0 )
       ~QRegExpValidator ()
       virtual QValidator::State validate ( QString & input, int & pos ) const
       void setRegExp ( const QRegExp & rx )
       const QRegExp & regExp () const

DESCRIPTION

       The QRegExpValidator class is used to check a string against a regular expression.

       QRegExpValidator contains a regular expression, "regexp", used to determine whether an input string is Acceptable, Intermediate or Invalid.

       The regexp is treated as if it begins with the start of string assertion, ^, and ends with the end of string assertion $ so the match is
       against the entire input string, or from the given position if a start position greater than zero is given.

       For a brief introduction to Qt's regexp engine see QRegExp.

       Example of use:

	   // regexp: optional '-' followed by between 1 and 3 digits
	   QRegExp rx( "-?\d{1,3}" );
	   QRegExpValidator validator( rx, 0 );
	   QLineEdit *edit = new QLineEdit( split );
	   edit->setValidator( &validator );

       Below we present some examples of validators. In practice they would normally be associated with a widget as in the example above.

	   // 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;
	   s = "0";	v.validate( s, 0 );    // returns Invalid
	   s = "12345"; v.validate( s, 0 );    // returns Invalid
	   s = "1";	v.validate( s, 0 );    // returns Acceptable
	   rx.setPattern( "\S+" );	       // one or more non-whitespace characters
	   v.setRegExp( rx );
	   s = "myfile.txt";  v.validate( s, 0 ); // Returns Acceptable
	   s = "my file.txt"; v.validate( s, 0 ); // 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, 0 );  // Returns Invalid
	   s = "A12345Z"; v.validate( s, 0 );  // Returns Acceptable
	   s = "B12";	  v.validate( s, 0 );  // 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, 0 ); // Returns Acceptable
	   s = "README.1ST";  v.validate( s, 0 ); // Returns Acceptable
	   s = "read me.txt"; v.validate( s, 0 ); // Returns Invalid
	   s = "readm";       v.validate( s, 0 ); // Returns Intermediate

       See also QRegExp, QIntValidator, QDoubleValidator, and Miscellaneous Classes.

MEMBER FUNCTION DOCUMENTATION

QRegExpValidator::QRegExpValidator ( QObject * parent, const char * name = 0 )
       Constructs a validator that accepts any string (including an empty one) as valid. The object's parent is parent and its name is name.

QRegExpValidator::QRegExpValidator ( const QRegExp & rx, QObject * parent, const char * name = 0 )
       Constructs a validator which accepts all strings that match the regular expression rx. The object's parent is parent and its name is name.

       The match is made against the entire string, e.g. if the regexp is [A-Fa-f0-9]+ it will be treated as ^[A-Fa-f0-9]+$.

QRegExpValidator::~QRegExpValidator ()
       Destroys the validator, freeing any resources allocated.

const QRegExp &; QRegExpValidator::regExp () const
       Returns the regular expression used for validation.

       See also setRegExp().

void QRegExpValidator::setRegExp ( const QRegExp & rx )
       Sets the regular expression used for validation to rx.

       See also regExp().

QValidator::State QRegExpValidator::validate ( QString & input, int & pos ) const [virtual]
       Returns Acceptable if input 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 input is not matched.

       The start position is the beginning of the string unless pos is given and is > 0 in which case the regexp is matched from pos until the end
       of the string.

       For example, if the regular expression is &#92;w&#92;d&#92;d (that is, word-character, digit, digit) then "A57" is Acceptable," E5" is
       Intermediate and "+9" is Invalid.

       See also QRegExp::match() and QRegExp::search().

       Reimplemented from QValidator.

SEE ALSO

       http://doc.trolltech.com/qregexpvalidator.html http://www.trolltech.com/faq/tech.html

COPYRIGHT

       Copyright 1992-2001 Trolltech AS, http://www.trolltech.com.  See the license file included in the distribution for a complete license
       statement.

AUTHOR

       Generated automatically from the source code.

BUGS

       If you find a bug in Qt, please report it as described in http://doc.trolltech.com/bughowto.html.  Good bug reports help us to help you.
       Thank you.

       The definitive Qt documentation is provided in HTML format; it is located at $QTDIR/doc/html and can be read using Qt Assistant or with a
       web browser. This man page is provided as a convenience for those users who prefer man pages, although this format is not officially
       supported by Trolltech.

       If you find errors in this manual page, please report them to qt-bugs@trolltech.com.  Please include the name of the manual page
       (qregexpvalidator.3qt) and the Qt version (3.1.1).

Trolltech AS							  9 December 2002					     QRegExpValidator(3qt)