How to Extract Data from Text Using Keywords in Node.js

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The Problem

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You want to extract everything that follows the colon : after each field and store that data into a variable for further processing. This problem is common in data parsing and can be tackled easily with JavaScript.

The Solution

Step 1: Split the Text into Lines

First, we need to split the text into separate lines. This allows us to handle each line individually.

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Here, split(/\r?\n/) is used to divide the text at each line break. This regular expression works for both Windows and Unix line endings, accommodating various environments.

Step 2: Create an Object to Store the Data

Next, we will create an object to hold the key-value pairs we extract from the text.

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This object will serve as a storage space for the properties (keys) and their corresponding values from each line.

Step 3: Iterate Over Each Line

Now it’s time to loop through each line of the text and check for the presence of a colon :. If found, we will separate the property and its value.

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Key Points:

We use the map function to iterate through each line.

The indexOf(':') method checks if a colon exists in the line.

If a colon is present, split(':') divides the line into the property and value.

We also employ trim() to remove any extra whitespace around the property name, ensuring clean key names in our data object.

Conclusion

Here's the complete code for reference:

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Final Thoughts