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andyford/collapse-whitespace-and-newlines.js

Last active September 18, 2020 19:48
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collapse whitespace and newlines
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collapse-whitespace-and-newlines.js
// use with CSS rule: 'white-space: pre-wrap;'
const collapsedString = originalString
// remove leading and trailing whitespace
.trim()
// remove spaces before/after newlines - https://stackoverflow.com/a/5568828 (in comment by ridgerunner)
.replace(/^[^\S\r\n]+|[^\S\r\n]+$/gm, "")
// collapse all spaces down to one space - https://stackoverflow.com/a/1981366
.replace(/ +/g, " ")
// collapse 3+ newlines down to 2 newlines (preserving paragraphs) - https://stackoverflow.com/a/10965543
.replace(/\n\s*\n\s*\n/g, "\n\n");
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andyford commented Sep 18, 2020

Just ran into a situation where I wanted to insert actual HTML p tags (when outputting content in an RSS feed). In this case, this package (or the regex it uses) is handy https://github.com/ryanburgess/lines-to-paragraphs

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