CODEWITHSUNDEEP
qtqstringqregexp
mkreddy
mkreddy

Reputation: 163

How to get a first word of from a Qstring

I want to get first word of a Qstring.

For example String1 = "Read from file1". I want to extract string2 = "Read". I want to extract substring based on whitespace.

If I encounter a first whitespace in my string1, I need that part of string1 to string2.

Upvotes: 3

Views: 12683

Answers (3)

Alex P
Alex P

Reputation: 1609

Use QString::split if you want to use all the parts, or QString::section if you just want to grab the first word.

For example, the most basic syntax is:

QString str = "Do re mi";
QString firstWord = str.section(" ", 0, 0);
// firstWord = "Do"

If you need to handle all kinds of weird whitespace, you can use the regex version of the functions:

QString str = "\tDo    re\nmi"; // tabs and newlines and spaces, oh my!
QString firstWord = str.section(QRegExp("\\s+"), 0, 0, 
    QString::SectionSkipEmpty);
// firstWord = "Do"

Upvotes: 5

Rud Limaverde
Rud Limaverde

Reputation: 686

Use the split function of QString in this way:

QString firstWord = string1.split(" ").at(0);

If there is no whitespace in the string, the whole string will be returned.

Upvotes: 6

vahancho
vahancho

Reputation: 21240

I would do:

QString s("Read from file1");
QString subStr = s.section(" ", 0, 0, QString::SectionSkipEmpty);

This will work correctly in case of such strings too:

" Read from file1 "

Upvotes: 1

Related Questions