regex-pipe

A transformation piping tool based on regex.

Table of contents

• Installation
• Examples
• Parsing
• Replacing
• Feedback
• License

Installation

This module is available on npm:

$ npm install regex-pipe

Examples

Parsing

The following example will show how to transform the content of a file to another.

const Pipe = require('regex-pipe');

const regex = /(blue|red|yellow)/;
const transformation = matches => 'I have a ' + matches[1] + ' house\n';

new Pipe('./in.txt', './out.txt')
   .parse(regex, transformation, { delimiter: Pipe.DELIMITERS.LINE_BY_LINE })
   .then(() => {
      // Now the out.txt file contains the output...
   })
   .catch(err => {
      // An error happened...
   });

Considering the in.txt content as:

They have a blue house
They have a red house
They have a yellow house

After the execution, the out.txt content will be:

I have a blue house
I have a red house
I have a yellow house

In other words, the Pipe.parse will replace every chunk of data with the return of the transformation function

Replacing

The following example will show how to replace the content of a file to another.

const Pipe = require('regex-pipe');

const regex = /blue/;
const replacement = 'red';

new Pipe('./in.txt', './out.txt')
   .replace(regex, replacement, { delimiter: Pipe.DELIMITERS.LINE_BY_LINE })
   .then(() => {
      // Now the out.txt file contains the output...
   })
   .catch(err => {
      // An error happened...
   });

Considering the in.txt content as:

They have a blue house

After the execution, the out.txt content will be:

They have a red house

This is much like to what the String.replace does

Feedback

If you want a feature to be added or give some other feedback, feel free to open an issue.

License

MIT