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How to extract Image URL using REGEX (NSRegularExpression) in IOS ! |
Sometimes its very difficult to find image link from an html string. if you have already html strings the us the below sample to extract images
SAMPLE-1
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NSRegularExpression* regex = [NSRegularExpression regularExpressionWithPattern:pattern options:0 error:&error]; NSArray *matchs = [regex matchesInString:item.summary options:0 range:rangeOfString]; if (matchs.count==0) { NSRegularExpression* regex1 = [NSRegularExpression regularExpressionWithPattern:@"(?i)\\b((?:[a-z][\\w-]+:(?:/{1,3}|[a-z0-9%])|www\\d{0,3}[.]|[a-z0-9.\\-]+[.][a-z]{2,4}/)(?:[^\\s()<>]+|\\(([^\\s()<>]+|(\\([^\\s()<>]+\\)))*\\))+(?:\\(([^\\s()<>]+|(\\([^\\s()<>]+\\)))*\\)|[^\\s`!()\\[\\]{};:'\".,<>?«»“”‘’]))" options:NSRegularExpressionCaseInsensitive error:NULL]; matchs = [regex1 matchesInString:item.summary options:0 range:rangeOfString]; } for (NSTextCheckingResult* match in matchs) { Imagestring=[item.summary substringWithRange:[match rangeAtIndex:1]]; NSString* path =Imagestring; NSString* extension = [path pathExtension]; if ([extension isEqualToString:@"jpg"]) { Imagestring=[item.summary substringWithRange:[match rangeAtIndex:1]]; myflag=false; break; } else if ([extension isEqualToString:@"png"]) { Imagestring=[item.summary substringWithRange:[match rangeAtIndex:1]]; myflag=false; break; } } |
SAMPLE-2
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NSRange rangeOfString = NSMakeRange(0, [searchedString length]); //NSLog(@"searchedString: %@", searchedString); NSString *pattern = @"src=\"([^\"]+)\""; NSError* error = nil; NSRegularExpression* regex = [NSRegularExpression regularExpressionWithPattern:pattern options:0 error:&error]; NSArray *matchs = [regex matchesInString:searchedString options:0 range:rangeOfString]; for (NSTextCheckingResult* match in matchs) { NSLog(@"url: %@", [searchedString substringWithRange:[match rangeAtIndex:1]]); Imagestring=[searchedString substringWithRange:[match rangeAtIndex:1]] break; } |
SAMPLE-3
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NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"http?://([-\\w\\.]+)+(:\\d+)?(/([\\w/_\\.]*(\\?\\S+)?)?)?" options:NSRegularExpressionCaseInsensitive error:&error]; NSArray *arrayOfAllMatches = [regex matchesInString:httpLine options:0 range:NSMakeRange(0, [httpLine length])]; NSMutableArray *arrayOfURLs = [[NSMutableArray alloc] init]; for (NSTextCheckingResult *match in arrayOfAllMatches) { NSString* substringForMatch = [httpLine substringWithRange:match.range]; NSLog(@"Extracted URL: %@",substringForMatch); [arrayOfURLs addObject:substringForMatch]; } // return non-mutable version of the array return [NSArray arrayWithArray:arrayOfURLs]; |