Qt Regex check for special characters

Question

I'm trying to check for special characters. I tried:

QString test;
test = "Hello";
QRegExp re("[^A-Za-z0-9]");
if (!re.exactMatch(test))
{
   log("False");
}

Which returns False

Also

int icount = test.count(QRegExp("[!@#$%^&()_+]"));

Which returns > 0

I don't know what am I doing wrong!

What I need is to know if a QString contains any other character than the valid: A-Z,a-z,0-9

your pattern could only match one single (non-letter) character, so if it matches the "h" in "hello", that isn't an "exact" match, it's partial....right? maybe [...]+ ? — Scott Weaver
– Scott Weaver, Commented Jan 27, 2018 at 15:26
Also the new QRegularExpression is faster and recommended for new code. — Daniel Nicoletti
– Daniel Nicoletti, Commented Jan 27, 2018 at 15:49
Quicker way to test your patterns: regexr.com (there are others also). Once it works there, it will work in Qt (just remember to double up any `\` in the C++ version). — Maxim Paperno
– Maxim Paperno, Commented Jan 28, 2018 at 1:09

Maxim Paperno · Accepted Answer · 2018-01-28 01:21:00Z

1

Try QRegExp::indexIn()

QRegExp re("[^A-Za-z0-9]");
if (re.indexIn("Hello") < 0)
   qDebug() << "No special chars";
else
   qDebug() << "Found at least one special char";

if (re.indexIn("Hello.") < 0)
   qDebug() << "No special chars";
else
   qDebug() << "Found at least one special char";

Output:

No special chars
Found at least one special char

answered Jan 28, 2018 at 1:21

Maxim Paperno

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