I have an API and it response me a string, that string contains a URLs of photos,
but the URLs contains special characters (backslash),
how can I remove that Special Character from String in API?
this is the String :
"photos":
"[\"uploads\\/products\\/photos\\/9UZGRucASnXoKsn6fnLqLcWYS7Ttb84JPOHOyJR1.jpeg\",\"uploads\\/products\\/photos\\/zjofjxnsjWus210f5S3YuijJMt9wXSnI6frgNRXc.jpeg\",\"uploads\\/products\\/photos\\/BA5oMG3EPVSDmQcLTYH3DZj1igwg4gMUvC6ItxmT.jpeg\",\"uploads\\/products\\/photos\\/gcCyQzli8M4ZGIWfcuU7DKf9C2y8rVxq5OpSHT9w.jpeg\",\"uploads\\/products\\/photos\\/1xPnp6ut6C7wJUlGHqUlnGrL6H3ClIPs0eFM96yc.jpeg\",\"uploads\\/products\\/photos\\/JjlVTcv6YencrYQClxCL2FRzMD6DUelfggtHVHbI.jpeg\",\"uploads\\/products\\/photos\\/b1iroJ8YWMj9PsTmSHML1iRlX3G8ayjYvhNP3bZO.jpeg\",\"uploads\\/products\\/photos\\/jUo1bUWi5bjEkk4c9WyQgGhUNGjqDYuFScildcq2.jpeg\"]",
When you have a string, you can pass in the url of the photo path in this case to a variable. Then you can use RegExp to replace all occurrences of a certain character in a String.
final myString = 'abc=';
final withoutEquals = myString.replaceAll(RegExp('='), ''); // abc
In your case:
String photoUrl = //Your photo Url
final cutPhotoUrl = photoUrl.replaceAll(RegExp('\'), ''); // Replaces all occurrences of backslash with blank whitespace
The idea really is to use the replaceAll method, but you must escape the backslash as it follows:
string.replaceAll(RegExp(r'\\'), '')
If you don't do so, you are actually escaping your last ` character and will get an error.
Related
I want to remove white space within a string like extra spaces in between the words. I have tried trim() method. but it only removes the leading and trailing whitespace I want to remove the spaces in between the string and I want to convert the first letter of the each word to capital .
example : var name = ' Aneesh devala ' to Aneesh Devala
I have tried this answers but it's not suitable for mine.
I hope this code will work for you.
String getCapitalizedName(String name) {
final names = name.split(' ');
String finalName = '';
for (var n in names) {
n.trim();
if (n.isNotEmpty) {
finalName += '${n[0].toUpperCase()}${n.substring(1)} ';
}
}
return finalName.trim();}
How to display Unicode Smiley from json response dynamically in flutter. It's display properly when i declare string as a static but from dynamic response it's not display smiley properly.
Static Declaration: (Working)
child: Text("\ud83d\ude0e\ud83d\ude0eThis is just test notification..\ud83d\ude0e\ud83d\ude0e\ud83d\udcaf\ud83d\ude4c")
Dynamic Response:
"message":"\\ud83d\\ude4c Be Safe at your home \\ud83c\\udfe0",
When i'm parse and pass this response to Text then it's consider Unicode as a String and display as a string instead of Smiley Code is below to display text with smiley:
child: Text(_listData[index].message.toString().replaceAll("\\\\", "\\"))
Already go through this: Question but it's only working when single unicode not working with multiple unicode.
Anyone worked with text along with unicode caracter display dynamically then please let me know.
Another alternate Good Solution I would give to unescape characters is this:
1st ->
String s = "\\ud83d\\ude0e Be Safe at your home \\ud83c\\ude0e";
String q = s.replaceAll("\\\\", "\\");
This would print and wont be able to escape characters:
\ud83d\ud83d Be Safe at your home \ud83c\ud83d
and above would be the output.
So what one can do is either unescape them while parsing or use:
String convertStringToUnicode(String content) {
String regex = "\\u";
int offset = content.indexOf(regex) + regex.length;
while(offset > 1){
int limit = offset + 4;
String str = content.substring(offset, limit);
// print(str);
if(str!=null && str.isNotEmpty){
String uni = String.fromCharCode(int.parse(str,radix:16));
content = content.replaceFirst(regex+str,uni);
// print(content);
}
offset = content.indexOf(regex) + regex.length;
// print(offset);
}
return content;
}
This will replace and convert all the literals into unicode characters and result and output of emoji:
String k = convertStringToUnicode(q);
print(k);
😎 Be Safe at your home 🈎
That is above would be the output.
Note: above answer given would just work as good but this is just when you want to have an unescape function and don't need to use third-party libraries.
You can extend this using switch cases with multiple unescape solutions.
Issue resolved by using below code snippet.
Client client = Client();
final response = await client.get(Uri.parse('YOUR_API_URL'));
if (response.statusCode == 200) {
// If the server did return a 200 OK response,
// then parse the JSON.
final extractedData = json.decode(response.body.replaceAll("\\\\", "\\"));
}
Here we need to replace double backslash to single backslash and then decode JSON respone before set into Text like this we can display multiple unicode like this:
final extractedData = json.decode(response.body.replaceAll("\\",
"\"));
Hope this answer help to other
I'm hoping this is an easy question, and that I'm just not seeing the forest due to all the trees.
I have a string in flutter than came from a REST API that looks like this:
"What\u0027s this?"
The \u is causing a problem.
I can't do a string.replaceAll("\", "\") on it as the single slash means it's looking for a character after it, which is not what I need.
I tried doing a string.replaceAll(String.fromCharCode(0x92), "") to remove it - That didn't work.
I then tried using a regex to remove it like string.replaceAll("/(?:\)/", "") and the same single slash remains.
So, the question is how to remove that single slash, so I can add in a double slash, or replace it with a double slash?
Cheers
Jase
I found the issue. I was looking for hex 92 (0x92) and it should have been decimal 92.
I ended up solving the issue like this...
String removeUnicodeApostrophes(String strInput) {
// First remove the single slash.
String strModified = strInput.replaceAll(String.fromCharCode(92), "");
// Now, we can replace the rest of the unicode with a proper apostrophe.
return strModified.replaceAll("u0027", "\'");
}
When the string is read, I assume what's happening is that it's being interpreted as literal rather than as what it should be (code points) i.e. each character of \0027 is a separate character. You may actually be able to fix this depending on how you access the API - see the dart convert library. If you use utf8.decode on the raw data you may be able to avoid this entire problem.
However, if that's not an option there's an easy enough solution for you.
What's happening when you're writing out your regex or replace is that you're not escaping the backslash, so it's essentially becoming nothing. If you use a double slash, that solve the problem as it escapes the escape character. "\\" => "\".
The other option is to use a raw string like r"\" which ignores the escape character.
Paste this into https://dartpad.dartlang.org:
String withapostraphe = "What\u0027s this?";
String withapostraphe1 = withapostraphe.replaceAll('\u0027', '');
String withapostraphe2 = withapostraphe.replaceAll(String.fromCharCode(0x27), '');
print("Original encoded properly: $withapostraphe");
print("Replaced with nothing: $withapostraphe1");
print("Using char code for ': $withapostraphe2");
String unicodeNotDecoded = "What\\u0027s this?";
String unicodeWithApostraphe = unicodeNotDecoded.replaceAll('\\u0027', '\'');
String unicodeNoApostraphe = unicodeNotDecoded.replaceAll('\\u0027', '');
String unicodeRaw = unicodeNotDecoded.replaceAll(r"\u0027", "'");
print("Data as read with escaped unicode: $unicodeNotDecoded");
print("Data replaced with apostraphe: $unicodeWithApostraphe");
print("Data replaced with nothing: $unicodeNoApostraphe");
print("Data replaced using raw string: $unicodeRaw");
To see the result:
Original encoded properly: What's this?
Replaced with nothing: Whats this?
Using char code for ': Whats this?
Data as read with escaped unicode: What\u0027s this?
Data replaced with apostraphe: What's this?
Data replaced with nothing: Whats this?
Data replaced using raw string: What's this?
I want to escape this string in SAPUI5 like this.
var escapedLongText = escape(unescapedLongText);
String (UTF-8 quote, space, Unicode quote)
" “
Escaped string
%22%20%u201C
I want to unescape it with this method, but it returns empty. Any ideas?
DATA: LV_STRING TYPE STRING.
LV_STRING = '%22%20%u201C'.
CALL METHOD CL_HTTP_UTILITY=>UNESCAPE_URL
EXPORTING
ESCAPED = LV_STRING
RECEIVING
UNESCAPED = LV_STRING.
I changed the code in SAPUI5 to the following:
var escapedLongText = encodeURI(unescapedLongText);
This results in: (like andreas mentioned)
%22%20%e2%80%9c
If I want to decode it later in SAPUI5, it can be done like this:
var unescapedLongText = unescape(decodeURI(escapedLongText));
The unescape needs to be done, because commas (for example) don't seem to be decoded automatically.
Is there an Android class that (correctly) encodes URLs containing unicode characters? For example:
Blue Öyster Cult
Is converted to the following using java.net.URI:
uri.toString()
(java.lang.String) Blue%20Öyster%20Cult
The Ö character is not encoded. Using URLEncoder:
URLEncoder.encode("Blue Öyster Cult", "UTF-8").toString()
(java.lang.String) Blue+%C3%96yster+Cult
It encodes too much (i.e. spaces become "+" and path separators "/" become %2F). If I click on a link containing unicode characters with the Dolphin web browser it works correctly, so obviously this can be done. But if I try to open an HttpURLConnection using any of the above strings, I get an HTTP 404 Not Found exception.
I ended up hacking together a solution that seems to work for this, but is probably not the most robust:
url = new URL(userSuppliedPath);
String context = url.getProtocol();
String hostname = url.getHost();
String thePath = url.getPath();
int port = url.getPort();
thePath = thePath.replaceAll("(^/|/$)", ""); // removes beginning/end slash
String encodedPath = URLEncoder.encode(thePath, "UTF-8"); // encodes unicode characters
encodedPath = encodedPath.replace("+", "%20"); // change + to %20 (space)
encodedPath = encodedPath.replace("%2F", "/"); // change %2F back to slash
urlString = context + "://" + hostname + ":" + port + "/" + encodedPath;
URLEncoder is designed to be used to encode form content, not whole URI's. Encoding / as %2F is intentional to prevent user input from being interpreted as a directory, and + is valid encoding for form data. (form data == part of the URI following the ?)
Ideally, you would encode "Blue Öyster Cult" before appending it to your base URI, instead of encoding the whole string. And if "Blue Öyster Cult" is part of the path instead of part of the query string, you have to replace + with %20 yourself. With these restrictions, URLEncoder works fine.