341d405f69
PatchSet.isRef() is used extensively when preparing for a ref advertisment and the regular expression used by isRefs() is notably costly in these circumstances. Even worse, the regular expression cannot be pre-compiled due to lacking RegEx-support in GWT (I guess later GWT versions introduces their own set of RegEx classes, not sure if we want to bring them into PatchSet though). By removing the regular expression and reimplementing the check, we could see upto a 15% performance increase when issuing a git ls-remote. Change-Id: If5a39210dc084bb7cd415cfdb25387657cee2fc7