discourse/app/assets/javascripts/pretty-text/censored-words.js.es6

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function escapeRegexp(text) {
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return text.replace(/[-/\\^$*+?.()|[\]{}]/g, '\\$&');
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}
export function censor(text, censoredWords, censoredPattern) {
let patterns = [],
originalText = text;
if (censoredWords && censoredWords.length) {
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patterns = censoredWords.split("|").map(t => `(${escapeRegexp(t)})`);
}
if (censoredPattern && censoredPattern.length > 0) {
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patterns.push("(" + censoredPattern + ")");
}
if (patterns.length) {
let censorRegexp;
try {
censorRegexp = new RegExp("(\\b(?:" + patterns.join("|") + ")\\b)(?![^\\(]*\\))", "ig");
if (censorRegexp) {
let m = censorRegexp.exec(text);
while (m && m[0]) {
if (m[0].length > originalText.length) { return originalText; } // regex is dangerous
const replacement = new Array(m[0].length+1).join('■');
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text = text.replace(new RegExp(`(\\b${escapeRegexp(m[0])}\\b)(?![^\\(]*\\))`, "ig"), replacement);
m = censorRegexp.exec(text);
}
}
} catch(e) {
return originalText;
}
}
return text;
}