C＃正则表达式仅在没有评论的情况下匹配

Question

I am writing an application for Avisynth-editing and try to get all variables which are defined as sources like the following ones with Regex:

Back = ImageReader("..\Backgrounds\Background_04.jpg", 0, Video.Framecount, 30, true).Spline16Resize(1920, 1080)

Video = ImageReader(".\Bilder\NDS Aufnahmebild.png", 0, 1000, 30, true)

I am using the following Regex which works great so far (global, case insensitive):

(?<var>[^#\s\t]\w+)(?:\s|\t)+?=(?:\s|\t)+?(ImageSource|ImageSourceAnim|ImageReader|ImageWriter)\((.*?)\)(?:\.|\n)?

The output would be:

Group "var" : Video

Group 0: ImageReader

Group 1: ".\\Bilder\\NDS Aufnahmebild.png", 0, 1000, 30, true

However it won't ignore comments which is really embarrasing. I want to capture the string only if there is no # before the match. I don't think that it's that complicated but at the moment I just don't get it.

I hope anybody can help me. I am using .Net Framework 4 and don't want to change the version.

Answer 1

As long as it is only # at beginning of the line, then you can simply try-match the # and then check if it actually did match it. If it didn't it is not commented, otherwise it is.

(?:\s|\t)*?(?<comment>#)?(?:\s|\t)*?(?<var>[^#\s\t]\w+)(?:\s|\t)+?=(?:\s|\t)+?(ImageSource|ImageSourceAnim|ImageReader|ImageWriter)\((.*?)\)(?:\.|\n)?

If comment group contains a # , then the line is commented out, so just ignore it in your application.