QRegularExpressionValidator Class

Detailed Description

QRegularExpressionValidator uses a regular expression (regexp) to determine whether an input string is Acceptable, Intermediate, or 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 Intermediate. For example, "" and "A" are Intermediate 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.

Example of use:

 // 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