CODEWITHSUNDEEP
c++regexqt
Šerg
Šerg

Reputation: 803

Qt C++ QRegExp parse string

I have the string str. I want to get two strings ('+' and '-'):

QString str = "+asdf+zxcv-tyupo+qwerty-yyuu oo+llad dd ff";

// I need this two strings:
// 1. For '+': asdf,zxcv,qwerty,llad dd ff
// 2. For '-': tyupo,yyuu oo


QRegExp rx("[\\+\\-](\\w+)");
int pos = 0;

while ((pos = rx.indexIn(str, pos)) != -1) {
    qDebug() << rx.cap(0);
    pos += rx.matchedLength();
}

Output I need:

"+asdf" 
"+zxcv" 
"-tyupo" 
"+qwerty" 
"-yyuu oo" 
"+llad dd ff"

Output I get:

"+asdf" 
"+zxcv" 
"-tyupo" 
"+qwerty" 
"-yyuu" 
"+llad"

If I replace \\w by .* the output is:

"+asdf+zxcv-tyupo+qwerty-yyuu oo+llad dd ff"

Upvotes: 2

Views: 1547

Answers (2)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 626689

You can use the following regex:

[+-]([^-+]+)

See regex demo

The regex breakdown:

  • [+-] - either a + or -
  • ([^-+]+) - a capturing group matching 1 or more symbols other than - and +.

Upvotes: 4

SingerOfTheFall
SingerOfTheFall

Reputation: 29966

Your regexp is excessive:

[\\+\\-](\\w+)
\______/\____/
    ^     ^--- any amount of alphabetical characters
    ^--- '+' or '-' sign

So what you are capturing is the +/- sign, and any word that follows it directly. If you want to capture only the +/- signs, use [+-] as a regular expression.

EDIT:

To get the strings including the spaces, you need

QRegExp rx("[+-](\\w|\\s)+");

Upvotes: 2

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