Organize multiline string based on regex pattern using Javascript

Question

Organize multiline string based on regex pattern using Javascript

I need to split a multi-line string and group it by a specific regex pattern that repeats throughout the text

Some random filler
in the beginning
of the content

Checking against xyz...
Text goes here
More text
and more.

Checking against abc...
Another set of text
with more details

Based on the above example, I want to create groups based on the text following the phrase Checking against (like xyz and abc in this case), with each group containing the lines after that term up until the next occurrence.

After grouping, the output should look something like this, making it easy to access the values under each category:

{
  xyz: 'Text goes here\nMore text\nand more.'
  abc: 'Another set of text\nwith more details'
}

To achieve this, my initial plan is to divide the string into an array of elements separated by newlines, but then I'm facing difficulties in:

Finding occurrences of "Checking against" and assigning them as keys
Appending every line until the next occurrence as the value for that key

javascript typescript group-by

Answer 1

Answer №1

You might want to give this a try

const text = `Add some initial content here
to start off

Checking against apple...
Some random text goes here
More text follows
and so on.

Checking against orange...
More details provided
even more information`;

let current = null;
const data = {};
text.split("\n").forEach(line => {
    const match = line.match(/Checking against (.+?)\.\.\./);
  if (match) {
    current = match[1];
  } else if (current && line !== "") {
    if (data[current]) {
        data[current] += "\n" + line
    } else {
        data[current] = line;
    }
  }
});
console.log(data)

Answer 2

You might want to give this a try

const text = `Add some initial content here
to start off

Checking against apple...
Some random text goes here
More text follows
and so on.

Checking against orange...
More details provided
even more information`;

let current = null;
const data = {};
text.split("\n").forEach(line => {
    const match = line.match(/Checking against (.+?)\.\.\./);
  if (match) {
    current = match[1];
  } else if (current && line !== "") {
    if (data[current]) {
        data[current] += "\n" + line
    } else {
        data[current] = line;
    }
  }
});
console.log(data)

Answer 3

Answer №2

In order to achieve this task, one approach is to utilize the split method to divide the entire text based on the occurrence of "Checking against," while simultaneously extracting the word that comes after it as part of the split criteria.

After removing the introductory section using slice(1), you can convert the array of keyword-text segments into pairs, which can then be processed with Object.fromEntries to generate the desired object:

let data = `Some filler
at the beginning
of the text

Checking against foo...
Some text here
More text
etc.

Checking against bar...
More text
moremoremore`;

let result = Object.fromEntries(
    data.split(/^Checking against (\w+).*$/gm)
        .slice(1)
        .reduce((acc, s, i, arr) => i%2 ? acc.concat([[arr[i-1], s.trim()]]) : acc, [])
);
console.log(result);

Answer 4

In order to achieve this task, one approach is to utilize the split method to divide the entire text based on the occurrence of "Checking against," while simultaneously extracting the word that comes after it as part of the split criteria.

After removing the introductory section using slice(1), you can convert the array of keyword-text segments into pairs, which can then be processed with Object.fromEntries to generate the desired object:

let data = `Some filler
at the beginning
of the text

Checking against foo...
Some text here
More text
etc.

Checking against bar...
More text
moremoremore`;

let result = Object.fromEntries(
    data.split(/^Checking against (\w+).*$/gm)
        .slice(1)
        .reduce((acc, s, i, arr) => i%2 ? acc.concat([[arr[i-1], s.trim()]]) : acc, [])
);
console.log(result);

Organize multiline string based on regex pattern using Javascript

Answer №1

Answer №2

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