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Non greedy regular expression like "\<.*?\>" not work in Qt4, but class QRegExp have method called setMinimal().

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QRegExp::setMinimal ( bool minimal )

This method tell QRegExp to use non-greedy "operators".
"\<.*?\>" still is not valid, but "\<.*\>" works like "\<.*?\>".

My idea is simple, just add "non-greedy" checkbox.
if checkbox is checked, RegExp.isMinimal() = true
if checkbox is not checked, RegExp.isMinimal() = false

mockup