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I have this particular string :
TOYIN KEMIOGS/OYO/2277TGOGSLAGOS
from this string containing 2 '/'
I want it to extract from wherever we have OGS and stop at wherever we have OGS. OGS always start and end my extracted string
I want an extracted result like this
OGS/OYO/2277TGOGS
Thanks so much
You can achieve it but as a string between first occurrence and last occurrence of OGS as follows:
var a = 'TOYIN KEMIOGS/OYO/2277TGOGSLAGOS';
console.log(a.slice(a.indexOf("OGS"),a.lastIndexOf("OGS")) +"OGS");
You can use match method of string to extract the data required.
const str = "TOYIN KEMIOGS/OYO/2277TGOGSLAGOS";
const result = str.match(/OGS.*OGS/); // Its greedy in nature so you can also use /OGS.*?OGS/
console.log(result[0]);
let str = "TOYIN KEMIOGS/OYO/2277TGOGSLAGOS";
let phrase = "OGS";
let start = str.indexOf(phrase);
let end = str.lastIndexOf(phrase) + phrase.length;
let newStr = str.slice(start, end);
console.log(newStr);
You can treat the start/stop sequences as non-matching groups:
const str = 'TOYIN KEMIOGS/OYO/2277TGOGSLAGOS';
const [match] = str.match(/(?:OGS).+(?:OGS)/);
console.log(match); // "OGS/OYO/2277TGOGS"
If you don't want to keep the start/stop sequences ("OGS"), you can treat them as positive lookbehind/lookaheads:
const str = 'TOYIN KEMIOGS/OYO/2277TGOGSLAGOS';
const [match] = str.match(/(?<=OGS).+(?=OGS)/);
console.log(match); // "/OYO/2277TG"
Here is a string manipulation version, which captures the first and last index.
const extractBetween = (str, marker) =>
str.slice(str.indexOf(marker),
str.lastIndexOf(marker) + marker.length);
const str = 'TOYIN KEMIOGS/OYO/2277TGOGSLAGOS';
const match = extractBetween(str, 'OGS');
console.log(match); // "OGS/OYO/2277TGOGS"
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i have a variable and I want to separate the name whit a space letter by letter and then UpperCase the letters
var name = "Tom Hanks";
console.log(name) has to be equal to "T O M H A N K S"
var name = "Tom Hanks";
var result = name.toUpperCase().split("").join(" ").replace(/\s+/g, " ");
console.log(result);
First you must split the string to separate the letters of the word and save 'em in a array object. For that you can use the String.split() function:
const myString = 'Tom Hanks';
const splittedString = myString.split('');
Then you can use Array.join() function to create a new string with spaces between the letters of the previous array:
const stringWithSpaces = splittedString.join(' ');
Finally you can use the String.toUpperCase() to set the "caps lock" on:
stringWithSpaces.toUpperCase();
So, here is the complete snippet:
const myString = 'Tom Hanks';
const splittedString = myString.split('');
const stringWithSpaces = splittedString.join(' ');
const upperCaseStringWithSpaces = stringWithSpaces.toUpperCase();
console.log(upperCaseStringWithSpaces);
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I have a situation to manipulate a given string which is separated by comma and reverse the given string.
Input: hello,world,wow
Expected Output: wow,world,hello
First split the string by the comma. Then reverse the array. Then turn it back into a string.
let foo = 'hello,world,wow' // assign the string
foo = foo.split(',') // splits by comma
foo = foo.reverse() // reverses the array
foo = foo.join() // converts array back into a comma separated string
var initialString = "hello,world,wow"
var finalString = initialString.split(",").reverse().join(",");
console.log(finalString) // "wow,world,hello"
Here is the solution to reverse the given string.
let str = "hello,world,wow";
let temp = str.split(",");
let output = "";
// Index will starting from last element
let index = (temp.length - 1);
for(let k=0; k<temp.length; k++){
if(k == (temp.length - 1)){
// Last Element so no need of comma
output += temp[index];
}
else {
// Adding commas to the output
output += temp[index]+",";
}
index--;
}
alert(output);
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Following are 2 strings:
" at callback (/Users/lem/Projects/RingAPI/packages/server/node_modules/loopback-connector-rest/lib/rest-builder.js:541:21)"
" at /Users/lem/Projects/RingAPI/packages/server/node_modules/#loopback/repository/node_modules/loopback-datasource-juggler/lib/observer.js:269:22"
How do I split them to these using JS and Regex?
['callback', '/Users/lem/Projects/RingAPI/packages/server/node_modules/loopback-connector-rest/lib/rest-builder.js', '541', '21']
['', '/Users/lem/Projects/RingAPI/packages/server/node_modules/#loopback/repository/node_modules/loopback-datasource-juggler/lib/observer.js', '269', '22']
try regexp named groups
https://github.com/tc39/proposal-regexp-named-groups
it adds result readability for such strange regexes ;)
const strings = [
" at callback (/Users/lem/Projects/RingAPI/packages/server/node_modules/loopback-connector-rest/lib/rest-builder.js:541:21)",
" at /Users/lem/Projects/RingAPI/packages/server/node_modules/#loopback/repository/node_modules/loopback-datasource-juggler/lib/observer.js:269:22"
];
const regex = /^\s*?at\s?(?<source>.*?)\s\(?(?<path>.*?):(?<row>\d*):(?<column>\d*)/;
strings.forEach(string => {
const result = string.match(regex);
resultElement.innerHTML +=
'\n' + JSON.stringify({string, "result.groups": result.groups}, null, 4)
})
<pre id="resultElement"/>
You can use regex for such purpose, i.e:
const regex = /at( (?:[a-z]+)?)\(?(.+)\:(\d+)\:(\d+)\)?/;
//const str = " at callback (/Users/lem/Projects/RingAPI/packages/server/node_modules/loopback-connector-rest/lib/rest-builder.js:541:21)";
const str = " at /Users/lem/Projects/RingAPI/packages/server/node_modules/#loopback/repository/node_modules/loopback-datasource-juggler/lib/observer.js:269:22";
const found = str.match(regex);
found.splice(0, 1)
console.log(found)
It works for both strings!
I've wrote simple parse function for you:
function parse(string) {
const functionName = string.match(/at .* /);
return [
...(functionName && [functionName[0].slice(2).trim()] || ['']),
...string.match(/\/.*/)[0].split(':')
];
}
First of all I try to extract function name. If it exists I remove 'at' word and use trim function to remove unnecessary spaces. Then I look for substring beginning with slash '/' and match every character after it. Last step is to split returned string.
I believe it matches your requirements.
I've also prepared demo in stackblitz: https://stackblitz.com/edit/js-ol22yf
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I have this code:
var str = 'country/city/area'
var idx = str.lastIndexOf('country/city')
// idx = 0
And idx is always 0. Shouldn't idx be 12? My goal is to use it substr() in order to take the string 'area' out of the str.
var str = 'country/city/area'
var pattern = 'country/city/'
var idx = str.lastIndexOf(pattern) + pattern.length
var substring = str.substring(idx, str.length)
Explanation
1) Define the pattern you are searching for
2) Find the beginning of the pattern and add the length of the pattern => now you are at the end
3) Copy the part behind the pattern to the end of the string
if you want to get the last word, you can search for the last forward slash and get everything after it:
str.substr(str.lastIndexOf('/') + 1)
if you want to get everything after 'country/city/' but for example you don't know if this the first part of the string, you can use
str.substr(str.indexOf('country/city/') + 13);
it's not 100% clear from your question, what exactly you are trying to achieve though.
You're going to want to add the length of the string that you search for:
var str = 'country/city/area';
var checkStr = 'country/city';
var idx = str.lastIndexOf(checkStr);
var lastCharIndex = idx + checkStr.length;
// idx = 0
// idx = 12
note - it would be 12, not 13, because you didn't include the final "/" in your lastIndexOf parameter.
May be you can achieve your goal as follows;
var str = 'country/city/area',
newStr = str.replace("/area","");
console.log(newStr);
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I have a requirement to remove last n characters from string or remove 'page' from a particular string.
Eg:
var string = 'facebookpage';
Expected output string = 'facebook'
I would like to remove 'page' from the string.
Done it using substring.
var str = "facebookpage";
str = str.substring(0, str.length - 4);
Could you help me to find some better way to do it.
Regex for this:
//str - string;
//n - count of symbols, for return
function(str, n){
var re = new RegExp(".{" + n + "}","i");
return str.match(re);
};
EDIT:
For remove last n characters:
var re = new RegExp(".{" + n + "}$","i");
return str.replace(re, "");
UPDATE:
But use regex for this task, not good way; For example, AVG Runtime for 100000 iterations:
Str length solution = 63.34 ms
Regex solution = 172.2 ms
Use javascript replace function
var str = "facebookpage";
str = str.replace('page','');
You can use this regular expression :
(.*)\\w{4}
code :
var regex =(new RegExp("(.*)\\w{4}"))
val output = regex .exec("facebookpage")
// output is : ["facebookpage", "facebook"]
// output[1] is the Expected output which you want.
Hope this helps.