Required a solution in searching string in NodeJs [duplicate] - javascript

This question already has answers here:
Use dynamic (variable) string as regex pattern in JavaScript
(8 answers)
Closed 5 years ago.
I have a string "platform:17.01.02" and I want to search for "17.01.02" which I'm giving through a variable.
a = "platform:17.01.02"
b = "17.01.02" (has to taken from user)
a.search(/b/)
The above statement search for "b" and not for variable value "b". Can any one help how can i search that?

Try this:
var a = "platform:17.01.02";
var b = "17.01.02";
console.log(a.search(new RegExp(b))); //9
If you just want to know if a contains b, use:
a.indexOf(b) >= 0

Related

i am unable to get specific regex [duplicate]

This question already has answers here:
How can I get query string values in JavaScript?
(73 answers)
Closed 5 years ago.
aa=&bb=0108135719&cc=20180108135935&dd=ee&ff=201801081358544265&gg=1&hh=1000&ii=&
i have a string like this and i trying to get specific value from it, it is in text format. what can i do if i want to get value of 'aa' it null and value of 'bb' it is 0108135719 tats it. I'm tried different regex but unable to get the desired output.
You can do something like
var t="aa=&bb=0108135719&cc=20180108135935&dd=ee&ff=201801081358544265&gg=1&hh=1000&ii=&".split("&")
console.log(t)
var ansObj = {}
t.forEach((element) => {
const elementArray = element.split("=")
const key = elementArray[0]
const value = elementArray[1]
ansObj[key] = value
})
console.log(ansObj)

Take Content url using javascript [duplicate]

This question already has answers here:
Getting parts of a URL with JavaScript
(5 answers)
Closed 5 years ago.
url:
http://xxxxxx.com/video/view/12345
Can I take 12345 in the url using javascript?
Please help me
Use RegExp, Array#match and negative lookahead.
var str = 'http://xxxxxx.com/video/view/12345';
console.log(str.match(/(?!view\/)\d+/)[0]);
You can also try this if you're sure that it'll always be in last:
var num = location.pathname.split('/').pop(); // "12345"
and further: parseInt(num);
You can parse your URL with the following code. Then just get the last part.
var url = 'http://xxxxxx.com/video/view/12345';
var url_parts = url.replace(/\/\s*$/,'').split('/');
console.log(url_parts[url_parts.length - 1]); // last part

can't remove parameter using javascript [duplicate]

This question already has answers here:
How can I delete a query string parameter in JavaScript?
(27 answers)
Closed 6 years ago.
i have a url like this
test.html?dir=asc&end_date=2016-09-23&order=created_at&start_date=2016-08-14
i want to remove the parameter using the following javascript
function removeParam(uri) {
uri = uri.replace(/([&\?]start_date=*$|start_date=*&|[?&]start_date=(?=#))/, '');
return uri.replace(/([&\?]end_date=*$|end_date=*&|[?&]end_date=(?=#))/, '');
}
but it didn't work, anyone know what's wrong with that?
in modern browsers you can do this quite simply
var x = new URL(location.origin + '/test.html?dir=asc&end_date=2016-09-23&order=created_at&start_date=2016-08-14');
x.searchParams.delete('start_date');
x.searchParams.delete('end_date');
var uri = x.pathname.substr(1) + x.search; // substr(1) because you don't have a leading / in your original uri
at least, I think it's simpler
Your RegExp is no match!
If you want remove end_date, you should:
uri.replace(/(end_date=)([^*&]+)/, 'end_date=')
And so on.

How to get a number from HTML form and pass it to JavaScript? [duplicate]

This question already has answers here:
How to convert a string to an integer in JavaScript
(32 answers)
Closed 7 years ago.
I am trying to calculate Body Mass Index by receiving Weight and Height from HTML form and passing it to JavaScript code by .getElementById();. But, as far as I understand, type of data received from form is "string" and I need to receive a "number". How can I solve this problem?
Use parseInt().
var a = "10";
var b = parseInt(a);
See : http://www.w3schools.com/jsref/jsref_parseint.asp
var a = document.getElementById("whatever").value;
// You can use any 3
+a; // Unary Operator
parseInt(a, 10); // parseInt with radix 10
Number(a);
you can use function parseInt(string) that Convert string into int .Now in your senario :-
var weight_str = document.getElementByID("weight");
var weight_int = parseInt(weight_str);
this will give you the result.

Get the last occurrence of string within another string [duplicate]

This question already has answers here:
endsWith in JavaScript
(30 answers)
Closed 9 years ago.
Is there a javascript function to get the last occurrence of a substring in a String
Like:
var url = "/home/doc/some-user-project/project";
I would like a function that returns true if the String contains project at his end.
I know str.indexOf() or str.lastIndexOf() but is there another function that do the job or should I do it?
Thanks for the answer
Something like
var check = "project",
url = "/home/doc/some-user-project/project";
if (url.substr(-check.length) == check){
// it ends with it..
}
Try this
<script>
var url = "/home/doc/some-user-project/project";
url.match(/project$/);
</script>
The response is a array with project, if the responde is 'null' because it is not found

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