Regex for QString::split() for two float numbers

Question

I have the QString line like this "567\n1.23456 2.34567\n1.23456 2.34"

And I want only "whole" float numbers only between \n characters.

I need QStringList after split() that contains only this float numbers. QString::split() can use RegEx so maybe I can use som regex here.

i tried QStringList myList = QString("56\n1.12345 2.34567\n1.23456 2.34").split('\n') that returns me ["1.2345 2.34567"] so i need split this again to ["1.23456"] and ["2.34567"]

score 0 · Answer 1 · answered Aug 15 '19 at 07:32

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this regex \d+(\.\d+)? will give you any float/int number!

answered Aug 15 '19 at 07:32

xrq0

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score 0 · Answer 2 · answered Aug 15 '19 at 08:18

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You should split at QRegularExpression("\\s+"). \s means whitespace (which includes both =space and \n=newline), + means one or more, and you need to escape the backslash.

answered Aug 15 '19 at 08:18

Martin Hennings

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score 0 · Accepted Answer · answered Aug 15 '19 at 08:33

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The Qt documentation for QString::split has your answer

QString str;
QStringList list;
str = "Some  text\n\twith  strange whitespace.";
list = str.split(QRegularExpression("\\s+"));
// list: [ "Some", "text", "with", "strange", "whitespace." ]

answered Aug 15 '19 at 08:33

zeFrenchy

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yes and after split i have 56, 1.12345 2.34567 1.23456 2.34, but i only need float numbers surrounded by "\n" characters. – AmeZir Aug 15 '19 at 09:22
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Then use split twice ... once using QChar('\n'), then using QChar(' ') or QRegularExpression("\\s+") depending on how reliable the whitespace between the floats is. – zeFrenchy Aug 15 '19 at 09:24

Regex for QString::split() for two float numbers

3 Answers3