ios - Regex for html string in Objective C -

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i getting html formatted string tags. there inconstancy "<br>" tag. getting"<br>" tag in random formats causes space in text. there solution trim these multiple "<br>" tags single one?

example of text :-

"some text..... <br>" "some text..... <br> <br>"   // <-- cause space. "some text..... <br>\n"    // <-- cause space. "some text..... <br>\n<br>" // <-- cause space. "some text..... <br><br>\n     <br>" // <-- cause space.

so in short, there can multiple "<br>" tags white spaces , \n character in it.

i need replace single "<br>" tag. can me regex same?

note:- don't want replace other string in between 2 "<br>" tags except white space , "\n" .

code written till - 

nsmutablestring *temp = [[nsmutablestring alloc] initwithstring:html];              [temp replaceoccurrencesofstring:@"<br><br>" withstring:@"<br>" options:0 range:nsmakerange(0, [temp length])];             [temp replaceoccurrencesofstring:@"<br>\n<br>" withstring:@"<br>" options:0 range:nsmakerange(0, [temp length])];             [temp replaceoccurrencesofstring:@"<br>\n" withstring:@"<br>" options:0 range:nsmakerange(0, [temp length])];

it's static string, needed regex it.

101 regex demo

find:    (<br>)(\s*\1)+ replace: $1

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