I have a code like this :
// Language = Dart
var someVariable = 'Hello';
var someOtherVariable = 'World';
var str = 'somedomain?x=${someVariable}&y=${someOtherVariable}';
return str;
// Expected:
// somedomain?x=Hello&y=World;
// Actual
// somedomain?x=Hello
If I replace the & character with any alphabets, it is able to successfully concatenate. What am I doing wrong.
This is the actual code which I used in FlutterFlow, and am having issues with:
Future<String> getEventUrlFromReference(BuildContext context, DocumentReference? eventReference) async {
var userId = currentUser?.uid as String;
return "https://somedomain.com/event?eventReference=${eventReference?.id}" + "&invitedBy="+userId;
}
// result: https://somedomain.com/event?eventReference=referencevalue
This was a string encoding issue. I was using the result of my function/code as body text in sms://<number>?&body=<string_containigng_&_character>; The text which is appended to the sms text truncates at the & character, and I made a mistake assuming it's a string concatenation issue.
Related
const test ="[{contactId=2525, additionDetail=samle}]";
I need to convert this string to a JSON object. It will dynamically load like this string. I need to particular string to convert to a JSON object.
JSON.parse(test) command not working for this. I attached the error here.
For that specific string, you'd have to parse it yourself.
const test = '[{contactId=2525, additionDetail=samle}]';
const obj = {};
test.split(/[{}]/)[1].split(/, /).forEach((elm) => {
const entry = elm.split('=');
obj[entry[0]] = entry[1];
});
What I am doing is splitting the string on the braces and selecting the second element (utilising regex) then splitting that on comma and space (again regex) then loop over the result and assign to an object.
You can then JSON.stringify(obj) for the result.
:edit:
For the second string you've asked for there is another, potentially more refined, answer. You'll need to first replace the = with : (I've again used a regex), then you use a regex to match the words and sentence and use a function to add the quotes.
const test = '[{contactId=2525, additionDetail=samle}]';
const test2 = "[{contactId=2525, additionDetail=rrr additional Detail, medicationType={medicationTypeId=3333, medicationType=Tablet}, endDate=2022-12-30}]";
const replaced = test.replace(/=/g,':')
const replaced2 = test2.replace(/=/g, ':');
const replacer = function(match){
return '"' + match + '"';
}
const replacedQuote = replaced.replace(/(?!\s)[-?\w ?]+/g,replacer);
const replaced2Quote = replaced2.replace(/(?!\s)[-?\w ?]+/g,replacer);
const obj = JSON.parse(replacedQuote);
const obj2 = JSON.parse(replaced2Quote);
You should note that Json means javascript object notation, so you need to create a JavaScript object to get started:
const test ="[{contactId=2525, additionDetail=samle}]";
let obj = Object.create(null)
You can now define your variable as one of the object properties :
obj.test = test
Now we have a JavaScript object and we can convert it to json:
let convertedToJson = JSON.stringify(test);
[{contactId=2525, additionDetail=samle}]
this is not a valid JSON-string, and it cannot be parsed by JSON.parse()
the correct JSON-string would be:
const test ='[{"contactId":2525, "additionDetail":"samle"}]';
Hello I'm looking for a way to split a string into two parts when only knowing one part. To clarify there is NO separator to determine where to split the string on.
After splitting the string it should be possible to recognize if the resulting part is the left or right part of the string.
Consider the following use case scenario (a very simple string, JS syntax):
const subject = 'foobar';
const known = 'foo';
const [left, right] = splitBySegment(subject, known);
console.log(left, right); // foo bar
Use RegExp (JS syntax):
function splitBySegment(subject, known) {
const escapeRegExp = new RegExp('[\\^$.*+?()[]{}|]', 'g');
const knownEscaped = known.replace(escapeRegExp, '\\$&');
const splitRegExp = new RegExp(
'^' +
`(?:${knownEscaped}|[A-Z]+(?=${knownEscaped}))` + // left
'|' +
`(?:${knownEscaped}|(?!${knownEscaped})[A-Z]+)` + // right
'$',
'g',
);
return subject.match(splitRegExp);
}
I am working on an Angular app and having a bit of a problem.
I am trying to test my API by appending a string into a URL.
It works fine when I hardcode the string into the URL but when I append it won't work.
this is a function that will get the string that I want to append.
getString(str: string){
this.strAppend = str
}
this is the URL,
url: string = http://localhost:3000/document/id/${this.strAppend}/transaction?from=1610742245&to=1623439932
notice how I use this.strAppend. Well, this is not working. Is this even the right approach?
You can use Template Literals to solve your problem.
var base = 'url'
getString(strToAdd: string) {
return `${base}/${strToAdd}`;
}
var newStr = getString('test');
First declare the variable in string
for time being refer this
$scope.str1 = 'This is ';
$scope.str2 = 'Sticked Toghether';
$scope.res = '';
$scope.join = function() {
$scope.res = $scope.str1 + $scope.str2;
};
I need to take 'href'(tag link location value) value from following pattern html text. need some expert help to do it using typescript
String Text one
"<html><body>docker_command.txt </body></html>"
String Text Two
"<html><body>https://www.facebook.com/ </body></html>"
Something like this?
const a = '"<html><body>docker_command.txt </body></html>"';
const b = '"<html><body>https://www.facebook.com/ </body></html>"';
function getHref(html: string): string|null {
if (!html) {
return null;
}
return html.match(/ href=("|')([^'"]*?)('|")/i)[2];
}
console.log(getHref(a));
console.log(getHref(b));
I have a find and replace script that works no problem when the words don't have any special characters. However, there will be a lot of times where there will be special characters since it's finding names. As of now this is breaking the script.
The script looks for {<some-text>} and attempts to replace the contents (as well as remove the braces).
Example:
text.rtf
Here's a name with special char {Kotouč}
script.ts
import * as fs from "fs";
// Ingest the rtf file.
const content: string = fs.readFileSync("./text.rtf", "utf8");
console.log("content::\n", content);
// The string we are looking to match in file text.
const plainText: string = "{Kotouč}";
// Look for all text that matches the patter `{TEXT_HERE}`.
const anyMatchPattern: RegExp = /{(.*?)}/gi;
const matches: string[] = content.match(anyMatchPattern) || [];
const matchesLen: number = matches.length;
for (let i: number = 0; i < matchesLen; i++) {
// It correctly identifies the targeted text.
const currMatch: string = matches[i];
const isRtfMetadata: boolean = currMatch.endsWith(";}");
if (isRtfMetadata) {
continue;
}
// Here I need a way to escape `plainText` string so that it matches the source.
console.log("currMatch::", currMatch);
console.log("currMatch === plainText::", currMatch === plainText);
if (currMatch === plainText) {
const newContent: string = content.replace(currMatch, "IT_WORKS!");
console.log("newContent:", newContent);
}
}
output
content::
{\rtf1\ansi\ansicpg1252\cocoartf1671\cocoasubrtf600
{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
{\colortbl;\red255\green255\blue255;}
{\*\expandedcolortbl;;}
\margl1440\margr1440\vieww10800\viewh8400\viewkind0
\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\pardirnatural\partightenfactor0
\f0\fs24 \cf0 Here's a name with special char \{Kotou\uc0\u269 \}.}
currMatch:: {Kotou\uc0\u269 \}
currMatch === plainText:: false
It looks like ANSI escaping, and I've tried using jsesc but that produces a different string, {Kotou\u010D} instead of what the document produces {Kotou\uc0\u269 \}.
How can I dynamically escape the plainText string variable so that it matches what is found in the document?
What I needed was to deepen my knowledge on rtf formatting as well as general text encoding.
The raw RTF text read from the file gives us a few hints:
{\rtf1\ansi\ansicpg1252\cocoartf1671\cocoasubrtf600...
This part of the rtf file metadata tells us a few things.
It is using RTF file formatting version 1. The encoding is ANSI, and specifically cpg1252, also known as Windows-1252 or CP-1252 which is:
...a single-byte character encoding of the Latin alphabet
(source)
The valuable piece of information from that is that we know it is using the Latin alphabet, this will be used later.
Knowing the specific RTF version used I stumbled upon the RTF 1.5 Spec
A quick search on that spec for one of the escape sequences that I was looking into revealed that it was an RTF specific escape control sequence, that is \uc0. So knowing that I was able to then parse what I was really after, \u269. Now I knew it was unicode and had a good hunch that the \u269 stood for unicode character code 269. So I look that up...
The \u269 (char code 269) shows up on this page to confirm. Now I know the character set and what needs done to get the equivalent plain text (unescaped), and there's a basic SO post I used here to get the function started.
Using all this knowledge I was able to piece it together from there. Here's the full corrected script and it's output:
script.ts
import * as fs from "fs";
// Match RTF unicode control sequence: http://www.biblioscape.com/rtf15_spec.htm
const unicodeControlReg: RegExp = /\\uc0\\u/g;
// Extracts the unicode character from an escape sequence with handling for rtf.
const matchEscapedChars: RegExp = /\\uc0\\u(\d{2,6})|\\u(\d{2,6})/g;
/**
* Util function to strip junk characters from string for comparison.
* #param {string} str
* #returns {string}
*/
const cleanupRtfStr = (str: string): string => {
return str
.replace(/\s/g, "")
.replace(/\\/g, "");
};
/**
* Detects escaped unicode and looks up the character by that code.
* #param {string} str
* #returns {string}
*/
const unescapeString = (str: string): string => {
const unescaped = str.replace(matchEscapedChars, (cc: string) => {
const stripped: string = cc.replace(unicodeControlReg, "");
const charCode: number = Number(stripped);
// See unicode character codes here:
// https://unicodelookup.com/#latin/11
return String.fromCharCode(charCode);
});
// Remove all whitespace.
return unescaped;
};
// Ingest the rtf file.
const content: string = fs.readFileSync("./src/TEST.rtf", "binary");
console.log("content::\n", content);
// The string we are looking to match in file text.
const plainText: string = "{Kotouč}";
// Look for all text that matches the pattern `{TEXT_HERE}`.
const anyMatchPattern: RegExp = /{(.*?)}/gi;
const matches: string[] = content.match(anyMatchPattern) || [];
const matchesLen: number = matches.length;
for (let i: number = 0; i < matchesLen; i++) {
const currMatch: string = matches[i];
const isRtfMetadata: boolean = currMatch.endsWith(";}");
if (isRtfMetadata) {
continue;
}
if (currMatch === plainText) {
const newContent: string = content.replace(currMatch, "IT_WORKS!");
console.log("\n\nnewContent:", newContent);
break;
}
const unescapedMatch: string = unescapeString(currMatch);
const cleanedMatch: string = cleanupRtfStr(unescapedMatch);
if (cleanedMatch === plainText) {
const newContent: string = content.replace(currMatch, "IT_WORKS_UNESCAPED!");
console.log("\n\nnewContent:", newContent);
break;
}
}
output
content::
{\rtf1\ansi\ansicpg1252\cocoartf1671\cocoasubrtf600
{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
{\colortbl;\red255\green255\blue255;}
{\*\expandedcolortbl;;}
\margl1440\margr1440\vieww10800\viewh8400\viewkind0
\pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\pardirnatural\partightenfactor0
\f0\fs24 \cf0 Here\'92s a name with special char \{Kotou\uc0\u269 \}}
newContent: {\rtf1\ansi\ansicpg1252\cocoartf1671\cocoasubrtf600
{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
{\colortbl;\red255\green255\blue255;}
{\*\expandedcolortbl;;}
\margl1440\margr1440\vieww10800\viewh8400\viewkind0
\pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\pardirnatural\partightenfactor0
\f0\fs24 \cf0 Here\'92s a name with special char \IT_WORKS_UNESCAPED!}
Hopefully that helps others that aren't familiar with character encoding/escaping and it's uses in rtf formatted documents!