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28 lines
758 B
JavaScript
28 lines
758 B
JavaScript
// Showdown extension that replaces words surrounded by singular underscores with <em> tags
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export const markdownUnderscoreExt = () => {
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try {
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if (!canUseNegativeLookbehind()) {
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console.log('Showdown-underscore extension: Negative lookbehind not supported. Skipping.');
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return [];
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}
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return [{
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type: 'lang',
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regex: new RegExp('\\b(?<!_)_(?!_)(.*?)(?<!_)_(?!_)\\b', 'g'),
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replace: '<em>$1</em>',
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}];
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} catch (e) {
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console.error('Error in Showdown-underscore extension:', e);
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return [];
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}
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};
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function canUseNegativeLookbehind() {
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try {
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new RegExp('(?<!_)');
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return true;
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} catch (e) {
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return false;
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}
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}
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