remove text between 2 strings with node.js

Question

I'm trying to create a script which should remove some text from a file with node.js.

I have this file:

bla bla 
bla bla
<script>
   this text should be
   removed.
export default {
  some stuff here
}
</script>

I just want to remove all the text between <script> and export default {.

Note: I want to keep both <script> and export default }

So do you want the valid script to be there and remove invalid data from script tag? Is the export default { will be always there? — Priya
– Priya, Commented May 9, 2017 at 18:09
I just want to remove everything between <script> and export regardless the correctness of the code. I've seen node.js has a truncate function but I don't know if I'm able to use it in this case. — splunk
– splunk, Commented May 9, 2017 at 18:14

Priya · Accepted Answer · 2017-05-10 11:09:32Z

2

Regular expression works well

str = str.replace(/(.*\<script\>).*(export.*)/,  '$1$2');

Note:- Read file as a string, synchronously if its big.

edited May 10, 2017 at 11:09

answered May 9, 2017 at 18:20

Priya

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Comments

Rob M. · Accepted Answer · 2017-05-09 18:24:25Z

1

A simple regex matching should suffice:

const content = `blah blah
blah blah
<script>
   this text should be
   removed.
export default {
  some stuff here
}
</script>`;

content.replace(/\<script\>([\s\S]*)export/g, '<script>export');

answered May 9, 2017 at 18:24

Rob M.

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Chris Rouffer · Accepted Answer · 2017-05-09 18:18:52Z

0

var lineReader = require('readline').createInterface({
    input: require('fs').createReadStream('test_input.txt')
});

const start_marker = '<script>';
const end_marker = 'export default';
var deleteEnabled = false;

lineReader.on('line', function(line) {
    if (!deleteEnabled && line.startsWith(start_marker)) {
        console.log(line);
        deleteEnabled = true;
    } else if (deleteEnabled && line.startsWith(end_marker)) {
        deleteEnabled = false;
    }

    if (!deleteEnabled) {
        console.log(line);
    }
});

This will start deleting lines when the start_marker is hit, and stop deleting when the end_marker is hit.

answered May 9, 2017 at 18:18

Chris Rouffer

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