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How to use 'javascript regex with variable' in JavaScript

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OpenNMS/opennms-helm
6function makeVariableRE(variableName) {
7  const reString = '\\$(' + variableName.replace(escapeRE, '\\$&') + ')\\b(\\[(.*?)\\])?';
8  return new RegExp(reString, 'g');
9}

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