I am using flickrApi in iPhone. After authenticiation, i get their userId as
inNSID = (_NSCFString) #"108346178%40N06"
Note the %40
In my app, I am saving the same id in my server. At some other place, where i have to authenticate again, i use this id to check if authentication is already done or not., when i try to compare this string with my string using isEqualToString , the result is NO.
Here is log trace
Printing description of tempAcc->serviceId:
108346178%40N06
Printing description of inNSID:
108346178%40N06
Both seems to be exactly same, how can I compare both? What is going on here.
Use NSRegularexpression to scan Unicode strings for any matches.
NSString *string = #"108346178%40N06";
NSError *error;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:string
options:NSRegularExpressionCaseInsensitive
error:&error];
NSTextCheckingResult *match = [regex firstMatchInString:string
options:NSMatchingReportCompletion
range:NSMakeRange(0, string.length)];
if (match) {
NSLog(#"yes");
} else {
NSLog(#"no");
}
Related
I am new to Regular Expressions and its usage in iOS .I have a scenario where I have to check whether a NSString starts with 'G' this is my function which returns the bool condition . I am passing the data like this
[self compareStringWithRegex:#"Gmail" withRegexPattern:#".*g"];
-(BOOL) compareStringWithRegex:(NSString *) string withRegexPattern:(NSString *)expression
{
NSError *error = NULL;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:expression options:NSRegularExpressionCaseInsensitive error:&error];
NSTextCheckingResult *match = [regex firstMatchInString:string options:0 range:NSMakeRange(0, [string length])];
if (match){
return YES;
}else{
return NO;
}
}
The problem I am facing is, this function returns true if I give wrong condition . Please help me in this and let me know if my question is not clear .
If you want to use Regular Expressions to check string start with "g" then
replace ".*g" with "^g" it will give you asspected result
[self compareStringWithRegex:#"Gmail" withRegexPattern:#"^g"];
If you really want to use regex the #"(g)+(\\w+)" should work. I tested it on Regex Tester
First off, I have no control over the text I am getting. Just wanted to put that out there so you know that I can't change the links.
The text I am trying to find links in using NSDataDetector contains the following:
<h1>My main item</h1>
<img src="http://www.blah.com/My First Image Here.jpg">
<h2>Some extra data</h2>
The detection code I am using is this, but it will not find this link:
NSDataDetector *linkDetector = [NSDataDetector dataDetectorWithTypes:NSTextCheckingTypeLink error:nil];
NSArray *matches = [linkDetector matchesInString:myHTML options:0 range:NSMakeRange(0, [myHTML length])];
for (NSTextCheckingResult *match in matches)
{
if ([match resultType] == NSTextCheckingTypeLink)
{
NSURL *url = [match URL];
// does some stuff
}
}
Is this a bug with Apple's link detection here, where it can't detect links with spaces, or am I doing something wrong?
Does anyone have a more reliable way to detect links regardless of whether they have spaces or special characters or whatever in them?
I just got this response from Apple for a bug I filed on this:
We believe this issue has been addressed in the latest iOS 9 beta.
This is a pre-release iOS 9 update.
Please refer to the release notes for complete installation
instructions.
Please test with this release. If you still have issues, please
provide any relevant logs or information that could help us
investigate.
iOS 9 https://developer.apple.com/ios/download/
I will test and let you all know if this is fixed with iOS 9.
You could split the strings into pieces using the spaces so that you have an array of strings with no spaces. Then you could feed each of those strings into your data detector.
// assume str = <img src="http://www.blah.com/My First Image Here.jpg">
NSArray *components = [str componentsSeparatedByString:#" "];
for (NSString *strWithNoSpace in components) {
// feed strings into data detector
}
Another alternative is to look specifically for that HTML tag. This is a less generic solution, though.
// assume that those 3 HTML strings are in a string array called strArray
for (NSString *htmlLine in strArray) {
if ([[htmlLine substringWithRange:NSMakeRange(0, 8)] isEqualToString:#"<img src"]) {
// Get the url from the img src tag
NSString *urlString = [htmlLine substringWithRange:NSMakeRange(10, htmlLine.length - 12)];
}
}
I've found a very hacky way to solve my issue. If someone comes up with a better solution that can be applied to all URLs, please do so.
Because I only care about URLs ending in .jpg that have this problem, I was able to come up with a narrow way to track this down.
Essentially, I break out the string into components based off of them beginning with "http:// into an array. Then I loop through that array doing another break out looking for .jpg">. The count of the inner array will only be > 1 when the .jpg"> string is found. I then keep both the string I find, and the string I fix with %20 replacements, and use them to do a final string replacement on the original string.
It's not perfect and probably inefficient, but it gets the job done for what I need.
- (NSString *)replaceSpacesInJpegURLs:(NSString *)htmlString
{
NSString *newString = htmlString;
NSArray *array = [htmlString componentsSeparatedByString:#"\"http://"];
for (NSString *str in array)
{
NSArray *array2 = [str componentsSeparatedByString:#".jpg\""];
if ([array2 count] > 1)
{
NSString *stringToFix = [array2 objectAtIndex:0];
NSString *fixedString = [stringToFix stringByReplacingOccurrencesOfString:#" " withString:#"%20"];
newString = [newString stringByReplacingOccurrencesOfString:stringToFix withString:fixedString];
}
}
return newString;
}
You can use NSRegularExpression to fix all URLs by using a simple regex to detect the links and then just encode the spaces (if you need more complex encoding you can look into CFURLCreateStringByAddingPercentEscapes and there are plenty of examples out there). The only thing that might take you some time if you haven't worked with NSRegularExpression before is how to iterate the results and do the replacing, the following code should do the trick:
NSError *error = NULL;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:#"src=\".*\"" options:NSRegularExpressionCaseInsensitive error:&error];
if (!error)
{
NSInteger offset = 0;
NSArray *matches = [regex matchesInString:myHTML options:0 range:NSMakeRange(0, [myHTML length])];
for (NSTextCheckingResult *result in matches)
{
NSRange resultRange = [result range];
resultRange.location += offset;
NSString *match = [regex replacementStringForResult:result inString:myHTML offset:offset template:#"$0"];
NSString *replacement = [match stringByReplacingOccurrencesOfString:#" " withString:#"%20"];
myHTML = [myHTML stringByReplacingCharactersInRange:resultRange withString:replacement];
offset += ([replacement length] - resultRange.length);
}
}
Try this regex pattern: #"<img[^>]+src=(\"|')([^\"']+)(\"|')[^>]*>" with ignore case ... Match index=2 for source url.
regex demo in javascript: (Try for any help)
Demo
Give this snippet a try (I got the regexp from your first commentator user3584460) :
NSError *error = NULL;
NSString *myHTML = #"<http><h1>My main item</h1><img src=\"http://www.blah.com/My First Image Here.jpg\"><h2>Some extra data</h2><img src=\"http://www.bloh.com/My Second Image Here.jpg\"><h3>Some extra data</h3><img src=\"http://www.bluh.com/My Third-Image Here.jpg\"></http>";
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:#"src=[\"'](.+?)[\"'].*?>" options:NSRegularExpressionCaseInsensitive error:&error];
NSArray *arrayOfAllMatches = [regex matchesInString:myHTML options:0 range:NSMakeRange(0, [myHTML length])];
NSTextCheckingResult *match = [regex firstMatchInString:myHTML options:0 range:NSMakeRange(0, myHTML.length)];
for (NSTextCheckingResult *match in arrayOfAllMatches) {
NSRange range = [match rangeAtIndex:1];
NSString* substringForMatch = [myHTML substringWithRange:range];
NSLog(#"Extracted URL : %#",substringForMatch);
}
In my log, I have :
Extracted URL : http://www.blah.com/My First Image Here.jpg
Extracted URL : http://www.bloh.com/My Second Image Here.jpg
Extracted URL : http://www.bluh.com/My Third-Image Here.jpg
You should not use NSDataDetector with HTML. It is intended for parsing normal text (entered by an user), not computer-generated data (in fact, it has many heuristics to actually make sure it does not detect computer-generated things which are probably not relevant to the user).
If your string is HTML, then you should use an HTML parsing library. There are a number of open-source kits to help you do that. Then just grab the href attributes of your anchors, or run NSDataDetector on the text nodes to find things not marked up without polluting the string with tags.
URLs really shouldn't contain spaces. I'd remove all spaces from the string before doing anything URL-related with it, something like the following
// Custom function which cleans up strings ready to be used for URLs
func cleanStringForURL(string: NSString) -> NSString {
var temp = string
var clean = string.stringByReplacingOccurrencesOfString(" ", withString: "")
return clean
}
I want to match number-number expression.I want to get input from textField, and need to format in way that,i can use that two numbers
How can i do this, by using regular expression or something else. Please give me a suggestion. User input. Number-Number. I have to filter out. number, number as Integer. Also i have to check whether user entered anything wrong in textfield.
If you use NSRegularExpression,
NSString *userInputString = #"1990-2020";
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:#"(\\d+)-(\\d+)" options:0 error:nil];
NSArray *matches = [regex matchesInString:userInputString options:NSMatchingReportProgress range:NSMakeRange(0, userInputString.length)];
for (NSTextCheckingResult *match in matches)
{
NSLog(#"%#", [userInputString substringWithRange:[match rangeAtIndex:1]]);
NSLog(#"%#", [userInputString substringWithRange:[match rangeAtIndex:2]]);
}
output:
1990
2020
I'm using the following code to detect an email in the string. It works fine except dealing with email having pure number prefix, such as "536264846#gmail.com". Is it possible to overcome this bug of apple? Any help will be appreciated!
NSString *string = #"536264846#gmail.com";
NSError *error = NULL;
NSDataDetector *detector = [NSDataDetector dataDetectorWithTypes:NSTextCheckingTypeLink error:&error];
NSArray *matches = [detector matchesInString:string
options:0
range:NSMakeRange(0, [string length])];
for (NSTextCheckingResult *match in matches) {
if ([match.URL.scheme isEqualToString:#"mailto"]) {
NSString *email = [match.URL.absoluteString substringFromIndex:match.URL.scheme.length + 1];
NSLog(#"email :%#",email);
}else{
NSLog(#"[match URL] :%#",[match URL]);
}
}
Edit:
log result is: [match URL] :http://gmail.com
What I did in the past:
tokenize the input, e.g., separate tokens using spaces (since most other common separators may be valid within an email). However, this may not be necessary if the regular expression is not anchored - but not sure how it would work without the "^" and "$" anchors (which I added to what was shown on the web site).
keep in mind that addresses may take the form '"string"' as well as just address
in each token, look for '#', as it's probably the best indicator you have that its an email address
run the token through the regular expression shown on this Email Detector comparison site (I found in testing that the one marked #1 as of 3/21/2013 worked best)
What I did was put the regular expression in a text file, so I didn't need to escape it:
^(?!(?:(?:\x22?\x5C[\x00-\x7E]\x22?)|(?:\x22?[^\x5C\x22]\x22?)){255,})(?!(?:(?:\x22?\x5C[\x00-\x7E]\x22?)|(?:\x22?[^\x5C\x22]\x22?)){65,}#)(?:(?:[\x21\x23-\x27\x2A\x2B\x2D\x2F-\x39\x3D\x3F\x5E-\x7E]+)|(?:\x22(?:[\x01-\x08\x0B\x0C\x0E-\x1F\x21\x23-\x5B\x5D-\x7F]|(?:\x5C[\x00-\x7F]))\x22))(?:.(?:(?:[\x21\x23-\x27\x2A\x2B\x2D\x2F-\x39\x3D\x3F\x5E-\x7E]+)|(?:\x22(?:[\x01-\x08\x0B\x0C\x0E-\x1F\x21\x23-\x5B\x5D-\x7F]|(?:\x5C[\x00-\x7F]))\x22)))#(?:(?:(?!.[^.]{64,})(?:(?:(?:xn--)?[a-z0-9]+(?:-[a-z0-9]+).){1,126}){1,}(?:(?:[a-z][a-z0-9])|(?:(?:xn--)[a-z0-9]+))(?:-[a-z0-9]+))|(?:[(?:(?:IPv6:(?:(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){7})|(?:(?!(?:.[a-f0-9][:]]){7,})(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,5})?::(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,5})?)))|(?:(?:IPv6:(?:(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){5}:)|(?:(?!(?:.*[a-f0-9]:){5,})(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,3})?::(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,3}:)?)))?(?:(?:25[0-5])|(?:2[0-4][0-9])|(?:1[0-9]{2})|(?:[1-9]?[0-9]))(?:.(?:(?:25[0-5])|(?:2[0-4][0-9])|(?:1[0-9]{2})|(?:[1-9]?[0-9]))){3}))]))$
Defined an ivar:
NSRegularExpression *reg
Created the regular expression:
NSString *fullPath = [[NSBundle mainBundle] pathForResource:#"EMailRegExp" ofType:#"txt"];
NSString *pattern = [NSString stringWithContentsOfFile:fullPath encoding:NSUTF8StringEncoding error:NULL];
NSError *error = nil;
reg = [NSRegularExpression regularExpressionWithPattern:pattern options:NSRegularExpressionCaseInsensitive error:&error];
assert(reg && !error);
Then wrote a method to do the comparison:
- (BOOL)isValidEmail:(NSString *)string
{
NSTextCheckingResult *match = [reg firstMatchInString:string options:0 range:NSMakeRange(0, [string length])];
return match ? YES : NO;
}
EDIT: I've turned the above into a project on github
EDIT2: for an alterate, less rigorous but faster, see the comment section of this question
Is there a way using NSRegularExpression to specify that you want to do a case-sensitive search? I am trying to match the upper-case TAG "ACL" in the text below. The pattern I am using is simply:
// Pattern
[A-Z]+
// SearchText
<td align=\"left\" nowrap><font face=\"courier, monospace\" size=\"-1\">ACL*</font></td>
// Code:
NSString *textBuffer = #"<td align=\"left\" nowrap><font face=\"courier, monospace\" size=\"-1\">ACL*</font></td>";
NSString *pattern = #"([A-Z]+)";
NSRegularExpression *regExp = [NSRegularExpression regularExpressionWithPattern:pattern options:NSRegularExpressionCaseInsensitive error:nil];
NSTextCheckingResult *result = [regExp firstMatchInString:textBuffer options:0 range:NSMakeRange(0, [textBuffer length])];
NSLog(#"OBJECT CLASS: %#", [textBuffer substringWithRange:[result range]]);
Output: (with case-Insensative I am getting the first "td" as expected, when what I really want is "ACL"
I know that NSRegularExpressionCaseInsensitive is wrong, I was hoping there would be a NSRegularExpressionCaseSensitive. Also there is a flagOption ?(i) that also specifies a case-insensitive search but again nothing for case-sensative. What am I missing?
Case sensitive is the default. Dont put the insensitive flag in there.