Regular expression template library inspired by logstash grok filter module, with a patch. (Upgrade oniguruma to fix security vulnerabilities and allow usage with newer versions of node) cloned from https://github.com/sreuter/node-grok/tree/patch-1 to make it work with nodejs 12 version
oniguruma for node.js with group tree, group name, group match indicator, and utilize oniguruma binary lib shiped with vscode when used in vscode extension