QRegularExpressionValidator ¶

概要 ¶

详细描述 ¶

QRegularExpressionValidator uses a regular expression (regexp) to determine whether an input string is Acceptable , 中间体 ，或 Invalid . The regexp can either be supplied when the QRegularExpressionValidator is constructed, or at a later time.

If the regexp partially matches against the string, the result is considered 中间体 . For example, “” and “A” are 中间体 for the regexp [A-Z][0-9] (whereas “_” would be Invalid ).

QRegularExpressionValidator automatically wraps the regular expression in the \\A and \\z anchors; in other words, it always attempts to do an exact match.

用法范例：

// regexp: optional '-' followed by between 1 and 3 digits
QRegularExpression rx("-?\\d{1,3}");
QValidator *validator = new QRegularExpressionValidator(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
QRegularExpression re("[1-9]\\d{0,3}");
// the validator treats the regexp as "^[1-9]\\d{0,3}$"
QRegularExpressionValidator v(re, 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
re.setPattern("\\S+");            // one or more non-whitespace characters
v.setRegularExpression(re);
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
re.setPattern("[A-C]\\d{5}[W-Z]");
v.setRegularExpression(re);
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
re.setPattern("read\\S?me(\.(txt|asc|1st))?");
re.setPatternOptions(QRegularExpression::CaseInsensitiveOption);
v.setRegularExpression(re);
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
											

另请参阅

QRegularExpression QIntValidator QDoubleValidator QRegExpValidator

class QRegularExpressionValidator ( [ parent=None ] ) ¶

QRegularExpressionValidator(re[, parent=None])

param parent

QObject

param re

QRegularExpression

构造验证器采用 parent object that accepts any string (including an empty one) as valid.

构造验证器采用 parent object that accepts all strings that match the regular expression re .

PySide2.QtGui.QRegularExpressionValidator. regularExpression ( ) ¶

返回类型

QRegularExpression

另请参阅

setRegularExpression()

PySide2.QtGui.QRegularExpressionValidator. regularExpressionChanged ( re ) ¶

参数

re – QRegularExpression

PySide2.QtGui.QRegularExpressionValidator. setRegularExpression ( re ) ¶

参数

re – QRegularExpression

另请参阅

regularExpression()