Delete blank lines using regex

Question

I'm new to iOS develoment, I have data like this below and I want to delete all empty lines. Please let me know which template will be applied:

I used the template as @ "(\ r \ n)" and replaced it with @ "", but it does not work. Please help me deal with this issue.

#EXTINF:-1 tvg-name="seedocs" tvg-logo="RT",RT





http://rt.ashttp14.visionip.tv/live/rt-global-live-HD/playlist.m3u8

#EXTINF:-1 tvg-name="hsn" tvg-logo="hsn",HSN TV

rtsp://hsn.mpl.miisolutions.net:1935/hsn-live01/_definst_/mp4:420p500kB31

#EXTINF:-1 tvg-name="us" tvg-logo="us",USTwit

http://bglive-a.bitgravity.com/twit/live/high

#EXTINF:-1 tvg-name="ALJAZEERA" tvg-logo="aljazeera",Aljazeera

rtmp://aljazeeraflashlivefs.fplive.net/aljazeeraflashlive-live/aljazeera_eng_high

#EXTINF:-1 tvg-name="bbc" tvg-logo="bbc",BBC World News



#EXTINF:-1 tvg-name="vevo" tvg-logo="vevo",Vevo

http://vevoplaylist-live.hls.adaptive.level3.net/vevo/ch1/06/prog_index.m3u8

#EXTINF:-1 tvg-name="vevo2" tvg-logo="vevo2",Vevo 2

http://vevoplaylist-live.hls.adaptive.level3.net/vevo/ch3/06/prog_index.m3u8

#EXTINF:-1 tvg-name="1HD" tvg-logo="1HD",1HD

rtmp://109.239.142.62/live/livestream3

Answer 1

Search: (?:\r?\n){2,} Replace:\r\n

\r?\ncompatible with both Windows and Linux. {2,}means "two or more instances"

demo

---

, \R \r?\n Unicode. , .

Answer 2

[\r\n]+

. demo.Replace \n.

https://regex101.com/r/vV1wW6/26

NSString *string = @"Your multiline string";
NSError *error = nil;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"[\r\n]+" options:NSRegularExpressionCaseInsensitive error:&error];
NSString *modifiedString = [regex stringByReplacingMatchesInString:string options:0 range:NSMakeRange(0, [string length]) withTemplate:@"\n"];

Answer 3

NSString stringByReplacingOccurrencesOfString:withString:options:range:
:
NSRegularExpressionSearch.

NSRegularExpression.

NSString *cleanText = [originalText stringByReplacingOccurrencesOfString:@"[\r\n]+" withString:@"\n" options:NSRegularExpressionSearch range:NSMakeRange(0, text.length)];

\r / \n \n, .