Referencia de la Clase QRegExpValidator

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

#include <qvalidator.h>

Diagrama de herencias de QRegExpValidator

Lista de todos los miembros.

Métodos públicos
	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
	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

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Descripción detallada

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}" );
    QValidator* validator = new QRegExpValidator( rx, this );

    QLineEdit* edit = new QLineEdit( this );
    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;
    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

Ver también:

QRegExp QIntValidator QDoubleValidator

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Documentación del constructor y destructor

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.

QRegExpValidator::QRegExpValidator	(	QObject *	parent,
		const char *	name = 0
	)

QRegExpValidator::QRegExpValidator	(	const QRegExp &	rx,
		QObject *	parent,
		const char *	name = 0
	)

QRegExpValidator::~QRegExpValidator

(

)

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Documentación de las funciones miembro

const QRegExp & QRegExpValidator::regExp

(

)

const [inline]

Returns the regular expression used for validation.

Ver también:

setRegExp()

const QRegExp& QRegExpValidator::regExp

(

)

const [inline]

void QRegExpValidator::setRegExp

(

const QRegExp &

rx

)

void QRegExpValidator::setRegExp

(

const QRegExp &

rx

)

Sets the regular expression used for validation to rx.

Ver también:

regExp()

virtual QValidator::State QRegExpValidator::validate	(	QString &	input,
		int &	pos
	)		const [virtual]

This pure virtual function returns Invalid if input is invalid according to this validator's rules, Intermediate if it is likely that a little more editing will make the input acceptable (e.g. the user types '4' into a widget which accepts integers between 10 and 99) and Acceptable if the input is valid.

The function can change input and pos (the cursor position) if it wants to.

Implementa QValidator.

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 pos parameter is set to the length of the input parameter.

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

Ver también:

QRegExp::match() QRegExp::search()

Implementa QValidator.

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La documentación para esta clase fue generada a partir de los siguientes ficheros:

• src/qt/include/qvalidator.h
• src/qt/src/widgets/qvalidator.h
• src/qt/src/widgets/qvalidator.cpp