Qt 之QRegExp

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邮箱验证：

QRegExp mailREX("\\b[A-Z0-9._%+-]+@[A-Z0-9.-]+\\.[A-Z]{2,4}\\b");mailREX.setCaseSensitivity(Qt::CaseInsensitive);mailREX.setPatternSyntax(QRegExp::RegExp);qDebug() << mailREX.exactMatch("me@me.com")
QRegExp passwordREX("[A-Z0-9a-z_]{6,9}");passwordREX.setPatternSyntax(QRegExp::RegExp);    
The emailvalidator.h file:
#ifndef EMAILVALIDATOR_H#define EMAILVALIDATOR_H#include <QValidator>QT_BEGIN_NAMESPACEclass QRegExp;QT_END_NAMESPACEclass EmailValidator : public QValidator{    Q_OBJECTpublic:    explicit EmailValidator(QObject *parent = 0);    State validate(QString &text, int &pos) const;    void fixup(QString &text) const;private:    const QRegExp m_validMailRegExp;    const QRegExp m_intermediateMailRegExp;};#endif // EMAILVALIDATOR_H
And the emailvalidator.cpp file:
#include "emailvalidator.h"EmailValidator::EmailValidator(QObject *parent) :    QValidator(parent),      m_validMailRegExp("[a-z0-9._%+-]+@[a-z0-9.-]+\\.[a-z]{2,4}"),      m_intermediateMailRegExp("[a-z0-9._%+-]*@?[a-z0-9.-]*\\.?[a-z]*"){}QValidator::State EmailValidator::validate(QString &text, int &pos) const{    Q_UNUSED(pos)    fixup(text);    if (m_validMailRegExp.exactMatch(text))        return Acceptable;    if (m_intermediateMailRegExp.exactMatch(text))        return Intermediate;    return Invalid;}void EmailValidator::fixup(QString &text) const{    text = text.trimmed().toLower();}

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