How to parse the key and get its value in javascript

up vote
1
down vote

favorite

I am opening a URL from javascript. I need to look for the term "colour: x" and then retrieve the value x.

request.get("URL", function (error, res, body)



val = body.indexOf('colour') -> works

which means that web page has the string "colour".

Web page looks like this

size: 8 colour: 1

So, Here I need to retrieve the value of the key 'colour'.

edited 15 hours ago

Manohar Reddy Poreddy

4,2764144

asked 16 hours ago

Tamilmani Natarajan

111

New contributor

add a comment |

up vote
1
down vote

favorite

I am opening a URL from javascript. I need to look for the term "colour: x" and then retrieve the value x.

request.get("URL", function (error, res, body)



val = body.indexOf('colour') -> works

which means that web page has the string "colour".

Web page looks like this

size: 8 colour: 1

So, Here I need to retrieve the value of the key 'colour'.

edited 15 hours ago

Manohar Reddy Poreddy

4,2764144

asked 16 hours ago

Tamilmani Natarajan

111

New contributor

add a comment |

up vote
1
down vote

favorite

I am opening a URL from javascript. I need to look for the term "colour: x" and then retrieve the value x.

request.get("URL", function (error, res, body)



val = body.indexOf('colour') -> works

which means that web page has the string "colour".

Web page looks like this

size: 8 colour: 1

So, Here I need to retrieve the value of the key 'colour'.

edited 15 hours ago

Manohar Reddy Poreddy

4,2764144

asked 16 hours ago

Tamilmani Natarajan

111

New contributor

I am opening a URL from javascript. I need to look for the term "colour: x" and then retrieve the value x.

request.get("URL", function (error, res, body)



val = body.indexOf('colour') -> works

which means that web page has the string "colour".

Web page looks like this

size: 8 colour: 1

So, Here I need to retrieve the value of the key 'colour'.

javascript

edited 15 hours ago

Manohar Reddy Poreddy

4,2764144

asked 16 hours ago

Tamilmani Natarajan

111

New contributor

edited 15 hours ago

Manohar Reddy Poreddy

4,2764144

asked 16 hours ago

Tamilmani Natarajan

111

New contributor

edited 15 hours ago

Manohar Reddy Poreddy

4,2764144

edited 15 hours ago

Manohar Reddy Poreddy

4,2764144

edited 15 hours ago

Manohar Reddy Poreddy

4,2764144

asked 16 hours ago

Tamilmani Natarajan

111

New contributor

asked 16 hours ago

Tamilmani Natarajan

111

asked 16 hours ago

Tamilmani Natarajan

111

New contributor

Tamilmani Natarajan is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment |

1 Answer
1

active

oldest

votes

up vote
2
down vote

To search for a pattern in any general text:

You can use a regular expression if you know how your information is written.

This regular expression should do the job :

/bcolour:s+(d+)/

(the word "colour:" followed by any space, and then by any number of digits (d+).

It captures the digits, so this will be the value of the first capture group (found[1]) in my example.

body = `size: 8 colour: 1`

    

let regex = /bcolour:s+(d+)/;

let found = body.match(regex);



console.log(found[1]);

In the case there is no match (i.e., no 'colour: xx' in the page), the found result will be null, so you should of course check for it before, for safety.

    body = `size: 8 but unfortunately, no colour here`

        

    let regex = /bcolour:s+(d+)/;

    let found = body.match(regex);



    //console.log(found[1]); // Uncaught TypeError: Cannot read property '1' of null

    

    // This snippet below is safe to use :

    if (found) {

       console.log(found[1]);

    } else {

       console.log('not found');

    }

edited 12 hours ago

answered 16 hours ago

Pac0

7,16722443

add a comment |

Your Answer

StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");

StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});

function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});

}
});

Tamilmani Natarajan is a new contributor. Be nice, and check out our Code of Conduct.

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53183964%2fhow-to-parse-the-key-and-get-its-value-in-javascript%23new-answer', 'question_page');
}
);

Post as a guest

Name

1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

up vote
2
down vote

To search for a pattern in any general text:

You can use a regular expression if you know how your information is written.

This regular expression should do the job :

/bcolour:s+(d+)/

(the word "colour:" followed by any space, and then by any number of digits (d+).

It captures the digits, so this will be the value of the first capture group (found[1]) in my example.

body = `size: 8 colour: 1`

    

let regex = /bcolour:s+(d+)/;

let found = body.match(regex);



console.log(found[1]);

In the case there is no match (i.e., no 'colour: xx' in the page), the found result will be null, so you should of course check for it before, for safety.

    body = `size: 8 but unfortunately, no colour here`

        

    let regex = /bcolour:s+(d+)/;

    let found = body.match(regex);



    //console.log(found[1]); // Uncaught TypeError: Cannot read property '1' of null

    

    // This snippet below is safe to use :

    if (found) {

       console.log(found[1]);

    } else {

       console.log('not found');

    }

edited 12 hours ago

answered 16 hours ago

Pac0

7,16722443

add a comment |

up vote
2
down vote

To search for a pattern in any general text:

You can use a regular expression if you know how your information is written.

This regular expression should do the job :

/bcolour:s+(d+)/

(the word "colour:" followed by any space, and then by any number of digits (d+).

It captures the digits, so this will be the value of the first capture group (found[1]) in my example.

body = `size: 8 colour: 1`

    

let regex = /bcolour:s+(d+)/;

let found = body.match(regex);



console.log(found[1]);

In the case there is no match (i.e., no 'colour: xx' in the page), the found result will be null, so you should of course check for it before, for safety.

    body = `size: 8 but unfortunately, no colour here`

        

    let regex = /bcolour:s+(d+)/;

    let found = body.match(regex);



    //console.log(found[1]); // Uncaught TypeError: Cannot read property '1' of null

    

    // This snippet below is safe to use :

    if (found) {

       console.log(found[1]);

    } else {

       console.log('not found');

    }

edited 12 hours ago

answered 16 hours ago

Pac0

7,16722443

add a comment |

up vote
2
down vote

To search for a pattern in any general text:

You can use a regular expression if you know how your information is written.

This regular expression should do the job :

/bcolour:s+(d+)/

(the word "colour:" followed by any space, and then by any number of digits (d+).

It captures the digits, so this will be the value of the first capture group (found[1]) in my example.

body = `size: 8 colour: 1`

    

let regex = /bcolour:s+(d+)/;

let found = body.match(regex);



console.log(found[1]);

In the case there is no match (i.e., no 'colour: xx' in the page), the found result will be null, so you should of course check for it before, for safety.

    body = `size: 8 but unfortunately, no colour here`

        

    let regex = /bcolour:s+(d+)/;

    let found = body.match(regex);



    //console.log(found[1]); // Uncaught TypeError: Cannot read property '1' of null

    

    // This snippet below is safe to use :

    if (found) {

       console.log(found[1]);

    } else {

       console.log('not found');

    }

edited 12 hours ago

answered 16 hours ago

Pac0

7,16722443

To search for a pattern in any general text:

You can use a regular expression if you know how your information is written.

This regular expression should do the job :

/bcolour:s+(d+)/

(the word "colour:" followed by any space, and then by any number of digits (d+).

It captures the digits, so this will be the value of the first capture group (found[1]) in my example.

body = `size: 8 colour: 1`

    

let regex = /bcolour:s+(d+)/;

let found = body.match(regex);



console.log(found[1]);

In the case there is no match (i.e., no 'colour: xx' in the page), the found result will be null, so you should of course check for it before, for safety.

    body = `size: 8 but unfortunately, no colour here`

        

    let regex = /bcolour:s+(d+)/;

    let found = body.match(regex);



    //console.log(found[1]); // Uncaught TypeError: Cannot read property '1' of null

    

    // This snippet below is safe to use :

    if (found) {

       console.log(found[1]);

    } else {

       console.log('not found');

    }

body = `size: 8 colour: 1`

    

let regex = /bcolour:s+(d+)/;

let found = body.match(regex);



console.log(found[1]);

body = `size: 8 colour: 1`

    

let regex = /bcolour:s+(d+)/;

let found = body.match(regex);



console.log(found[1]);

    body = `size: 8 but unfortunately, no colour here`

        

    let regex = /bcolour:s+(d+)/;

    let found = body.match(regex);



    //console.log(found[1]); // Uncaught TypeError: Cannot read property '1' of null

    

    // This snippet below is safe to use :

    if (found) {

       console.log(found[1]);

    } else {

       console.log('not found');

    }

    body = `size: 8 but unfortunately, no colour here`

        

    let regex = /bcolour:s+(d+)/;

    let found = body.match(regex);



    //console.log(found[1]); // Uncaught TypeError: Cannot read property '1' of null

    

    // This snippet below is safe to use :

    if (found) {

       console.log(found[1]);

    } else {

       console.log('not found');

    }

edited 12 hours ago

answered 16 hours ago

Pac0

7,16722443

edited 12 hours ago

answered 16 hours ago

Pac0

7,16722443

answered 16 hours ago

Pac0

7,16722443

answered 16 hours ago

Pac0

7,16722443

add a comment |

Tamilmani Natarajan is a new contributor. Be nice, and check out our Code of Conduct.

draft saved

draft discarded

Tamilmani Natarajan is a new contributor. Be nice, and check out our Code of Conduct.

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Post as a guest

Name

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Name

This page is only for reference, If you need detailed information, please check here

搜尋此網誌

Zystkmt