import Foundation
let pattern = ##"""
<a\s+ # Look for '<a' followed by whitespace
([^>]+\s+)? # Look for anything else that isn't 'href='
# such as 'class=' or 'id='
href\s*=\s* # locate the 'href=' with any whitespace around the '=' character
(
'([^']*)' # Look for '...'
| # ...or...
"([^"]*) # Look for "..."
| # ...or...
([^\s>]+) # Look anything NOT '>' or spaces
)
[^>]*> # Match anything else up to the closing '>'
"""##
let regex = try! NSRegularExpression(pattern: pattern, options: [.anchorsMatchLines, .allowCommentsAndWhitespace])
let testString = ##"""
<!DOCTYPE html>
<html>
<head>
<title>Hyperlinks</title>
<link href="theme.css" rel="stylesheet" />
</head>
<body>
<ul><li><a href="/" id="home">Home</a></li><li><a
class="selected" href=/courses>Courses</a>
</li><li><a href =
'/forum' >Forum</a></li><li><a class="href"
onclick="go()" href= "#">Forum</a></li>
<li><a id="js" href =
"javascript:alert('hi yo')" class="new">click</a></li>
<li><a id='nakov' href =
http://www.nakov.com class='new'>nak</a></li></ul>
<a href="#empty"></a>
<a id="href">href='fake'<img src='http://abv.bg/i.gif'
alt='abv'/></a><a href="#"><a href='hello'></a>
<!-- This code is commented:
<a href="#commented">commentex hyperlink</a> -->
</body>
"""##
let stringRange = NSRange(location: 0, length: testString.utf16.count)
let matches = regex.matches(in: testString, range: stringRange)
var result: [[String]] = []
for match in matches {
var groups: [String] = []
for rangeIndex in 1 ..< match.numberOfRanges {
let nsRange = match.range(at: rangeIndex)
guard !NSEqualRanges(nsRange, NSMakeRange(NSNotFound, 0)) else { continue }
let string = (testString as NSString).substring(with: nsRange)
groups.append(string)
}
if !groups.isEmpty {
result.append(groups)
}
}
print(result)
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Swift 5.2, please visit: https://developer.apple.com/documentation/foundation/nsregularexpression