QRegularExpression to replace match

Roberrt

Given the str:

border: 2px solid #a4002c; /**/

I'm trying to replace just the value between # and ; in this case a4002c

I've tested the regex I'm using here and seen to be working:
https://regex101.com/r/PS1ZXU/1

But when i use it on qt:

auto re = QRegularExpression (R"(border.*?#\s*(.*);\s*\/)");
str = str.replace(re, "12ff00"));

The str mentioned above is being replaced to:

12ff00**/

I'm probably missing something in the .replace line
specially here: (re, "12ff00"));

I'm not good with regex, appreciate any help on this task.

JonB

@Roberrt
Your regular expression in itself is fine at matching all the way to the first /, as regex101 shows you. Your problem is in the replacement: you replace all of that match with your 12ff00, hence the final result of 12ff00**/. You would want to preserve much more of the original string.

There are many ways of doing this, depending on exactly what you want. Reading your original requirement:

I'm trying to replace just the value between # and ; in this case a4002c

let's do just that?

auto re = QRegularExpression("#[^;]*");
str = str.replace(re, "#12ff00"));

"Replace a # followed by any number of non-; characters by #12ff00. The rest of the string (before and after the match) remains as-is.

As I say, there are many other possibilities depending on exactly what your requirement is. Maybe you will say "but I must only do this if there is border there" or "fine, but I'd like to make my original regular expression work".

P.S.
I don't think you noticed that at regex101 in the left-hand pane under FUNCTION you had the default of Match. You can test by changing that to Substitution. I have done so for your original expression at https://regex101.com/r/ZgjhKI/1 , so you can see.