I need to find multiple urls within a string. The regex I'm using is
(https?:\/\/.*\.(?:png|jpg))
and the string is
Newhttps://www.findregexhere.com/newimage.pngfrhttps://www.findregexhere.com/newimage.pngnewimage
Here is the code I am using
let regex = try NSRegularExpression(pattern: "https?:\/\/.*\.(?:png|jpg)$", options: .caseInsensitive)
let nsString = text as NSString
let results = regex.matches(in: text, range: NSRange(location: 0, length: nsString.length))
but the result is giving me this
https://www.findregexhere.com/newimage.pngfrhttps://www.findregexhere.com/newimage.png
Try non-greedy with...
(https?:\/\/.*?\.(?:png|jpg))
Demo: https://regex101.com/r/AK5foS/1
Related
I'm finally learning swift. The documentation that I've seen for regex in swift consist of something like the following:
let testString = "hat"
let range = NSRange(location: 0, length: testString.utf16.count)
let regex = try! NSRegularExpression(pattern: "[a-z]at")
let r = regex.firstMatch(in: testString, options: [], range: range) != nil
print("ns-based regex match?: ", r)
Is this the preferred/only way of doing this or is there an updated technique?
It's a bit verbose.
We’d often just use range(of:options:range:locale:) with a .regularExpression:
let testString = "foo hat"
if let range = testString.range(of: "[a-z]at", options: .regularExpression) {
print(testString[range])
}
If you don't need some of the more advanced NSRegularExpression options, the above is bit simpler.
I have the RSS page with the html tag like this:
<description>
<![CDATA[
<a href='https://www.24h.com.vn/bong-da/psg-trao-than-dong-mbappe-sieu-luong-bong-chi-kem-messi-real-vo-mong-c48a1112120.html' title='PSG trao thần đồng Mbappe siĂªu lÆ°Æ¡ng bổng: Chỉ kĂ©m Messi, Real vỡ má»™ng'><img width='130' height='100' src='https://image.24h.com.vn/upload/4-2019/images/2019-12-27/1577463916-359-thumbnail.jpg' alt='PSG trao thần đồng Mbappe siĂªu lÆ°Æ¡ng bổng: Chỉ kĂ©m Messi, Real vỡ má»™ng' title='PSG trao thần đồng Mbappe siĂªu lÆ°Æ¡ng bổng: Chỉ kĂ©m Messi, Real vỡ má»™ng' /></a><br />PSG trong ná»— lá»±c giữ chĂ¢n “sĂ¡t thủ†Kylian Mbappe, sẵn sĂ ng tăng lÆ°Æ¡ng khổng lồ - má»™t Ä‘á»™ng thĂ¡i nhằm xua Ä‘uổi Real Madrid.
]]>
</description>
Please help me how can i get the value of src to show the image. I also try Getting img url from RSS feed swift but it doesn't work. Here is my code to get src (the code always run to image = "nil"):
let regex: NSRegularExpression = try! NSRegularExpression(pattern: "<img.*?src=\"([^\"]*)\"", options: .caseInsensitive)
let range = NSMakeRange(0, description.count)
if let textCheck = regex.firstMatch(in: description, options: .withoutAnchoringBounds, range: range) {
let text = (description as NSString).substring(with: textCheck.range(at: 1))
image = text
} else {
image = "nil"
}
Thank for your helping !
You need to change your regex to be able to match single-quotes as well, not just double quotes, since the html string you're trying to parse contains single quotes, not double quotes like the one in the linked Q&A.
let regex: NSRegularExpression = try! NSRegularExpression(pattern: "<img.*?src=[\"\']([^\"\']*)[\"\']", options: .caseInsensitive)
If you are sure you only need to match single quotes, you can simplify the pattern by replacing [\"\'] with \'. Currently, the regex pattern will match both single and double quotes.
I have string like below
<p><strong>I am a strongPerson</strong></p>
I want to covert this string like this
<p><strong>I am a weakPerson</strong></p>
When I try below code
let old = "<p><strong>I am a strongPerson</strong></p>"
let new = old.replacingOccurrences(of: "strong", with: "weak")
print("\(new)")
I am getting output like
<p><weak>I am a weakPerson</weak></p>
But I need output like this
<p><strong>I am a weakPerson</strong></p>
My Condition here is
1.It has to replace only if word does not contain these HTML Tags like "<>".
Help me to get it. Thanks in advance.
You can use a regular expression to avoid the word being in a tag:
let old = "strong <p><strong>I am a strong person</strong></p> strong"
let new = old.replacingOccurrences(of: "strong(?!>)", with: "weak", options: .regularExpression, range: nil)
print(new)
I added some extra uses of the word "strong" to test edge cases.
The trick is the use of (?!>) which basically means to ignore any match that has a > at the end of it. Look at the documentation for NSRegularExpression and find the documentation for the "negative look-ahead assertion".
Output:
weak <p><strong>I am a weak person</strong></p> weak
Try the following:
let myString = "<p><strong>I am a strongPerson</strong></p>"
if let regex = try? NSRegularExpression(pattern: "strong(?!>)") {
let modString = regex.stringByReplacingMatches(in: myString, options: [], range: NSRange(location: 0, length: myString.count), withTemplate: "weak")
print(modString)
}
In Swift 4.2, NSRegularExpression does not match anything after CRLF. Why?
let str = "\r\nfoo"
let regex = try! NSRegularExpression(pattern: "foo")
print(regex.firstMatch(in: str, range: NSRange(location: 0, length: str.count))) // => nil
If you remove "\r" or "\n", you get a instance of NSTextCheckingResult.
In Swift 4 a new initializer of NSRange was introduced to convert reliably Range<String.Index> to NSRange.
Use it always, it solves your issue.
let str = "\r\nfoo"
let regex = try! NSRegularExpression(pattern: "foo")
print(regex.firstMatch(in: str, range: NSRange(str.startIndex..., in: str)))
What would be the best way to change this string:
"gain quickness for 5 seconds. <c=#reminder>(Cooldown: 90s)</c> only after"
into an Attributed String while getting rid of the part in the <> and I want to change the font of (Cooldown: 90s). I know how to change and make NSMutableAttributedStrings but I am stuck on how to locate and change just the (Cooldown: 90s) in this case. The text in between the <c=#reminder> & </c> will change so I need to use those to find what I need.
These seem to be indicators meant to be used for this purpose I just don't know ho.
First things first, you'll need a regular expression to find and replace all tagged strings.
Looking at the string, one possible regex could be <c=#([a-zA-Z-9]+)>([^<]*)</c>. Note that will will work only if the string between the tags doesn't contain the < character.
Now that we have the regex, we only need to apply it on the input string:
let str = "gain quickness for 5 seconds. <c=#reminder>(Cooldown: 90s)</c> only after"
let attrStr = NSMutableAttributedString(string: str)
let regex = try! NSRegularExpression(pattern: "<c=#([a-zA-Z-9]+)>([^<]*)</c>", options: [])
while let match = regex.matches(in: attrStr.string, options: [], range: NSRange(location: 0, length: attrStr.string.utf16.count)).first {
let indicator = str[Range(match.range(at: 1), in: str)!]
let substr = str[Range(match.range(at: 2), in: str)!]
let replacement = NSMutableAttributedString(string: String(substr))
// now based on the indicator variable you might want to apply some transformations in the `substr` attributed string
attrStr.replaceCharacters(in: match.range, with: replacement)
}