How to use 'regex remove empty lines' in JavaScript

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function removeInitialEmptyLines(lines) {
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    var i;
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    for (i = 0; i < lines.length; i++) {
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        if (lines[i].trim() !== "") {
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            break;
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        }
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    }
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    if (i !== 0) {
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        lines = lines.slice(i);
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    }
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    return lines;
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}

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function sanitizeLine(line) {
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    var regMatch = line.match(pattern.matchPattern);
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    var matches  = (regMatch || [''])[0];
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    var indent   = pattern.getIndent(matches.length);
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    return {
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        replaceWith: new Array(indent + 1).join(pattern.replaceWith),
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        start: 0,
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        end: matches.length
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    };
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}