D12854: Awk: fix regex in a function and update syntax for gawk

[jonathan poelen]

jpoelen added reviewers: Framework: Syntax Highlighting, dhaumann.

REPOSITORY
  R216 Syntax Highlighting

REVISION DETAIL
  https://phabricator.kde.org/D12854

To: jpoelen, #framework_syntax_highlighting, dhaumann
Cc: kde-frameworks-devel, michaelh, genethomas, ngraham, bruns, cullmann, 
vkrause, dhaumann