Is there principal difference between QRegularExpression and QRegExp?

[bogong]

Hello!
Which is better to use QRegularExpression and QRegExp? Is there principal difference between this two classes?

[mrjj]

Hi
You should use QRegularExpression
Docs says
Note: In Qt 5, the new QRegularExpression class provides a Perl compatible implementation of regular expressions and is recommended in place of QRegExp.

So i guess the biggest difference is its compatibility

[SGaist]

Hi,

QRegExp is a custom regular expression implementation.
QRegularExpression uses PCRE as a backend.
Also, QRegExp should be considered deprecated and not used in new code.