Develop plugin watching file and appear wavy line
Answered
Hello
I want to develop Intelli J's plugin.
Just always watch source file, and just check by regex and appear wavy lines.
I want to watch (monitoring) file's source code by regex.
What type should I select the menu? or other?
A wavy line means like this.

I am not an English speaker, so I don't know how to call it in the correct name.
how to draw the line?
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You can use Annotator (http://www.jetbrains.org/intellij/sdk/docs/reference_guide/custom_language_support/syntax_highlighting_and_error_highlighting.html) or Inspections (http://www.jetbrains.org/intellij/sdk/docs/tutorials/code_inspections.html) to add highlightings.