Lexer Hangs on Strings Containing `$`

[ericevenchick]

This lexer seems to hang on the following code (from https://github.com/opencomputeproject/Rack-Manager/blob/e1a61d3eeeba0ff655fe9c1301e8b510d9b2122a/Contrib-Inspur/openbmc/meta-phosphor/conf/distro/include/phosphor-defaults.inc#L242):

EXTRA_USERS_PARAMS_pn-obmc-phosphor-image = " \
  usermod -p '\$1\$UGMqyqdG\$FZiylVFmRRfl9Z0Ue8G7e/' root; \
  "

I believe this has to do with the $ chars within the password hash.