// 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
QRegExp rxlen("(\\d+)(?:\\s*)(cm|inch)");
int pos = rxlen.indexIn("Length: 189cm");
if (pos > -1) {
QString value = rxlen.cap(1); // "189"
QString unit = rxlen.cap(2); // "cm"
// ...
}
Qt使用正則實例
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