Directory Origin produces field names enclosed in 'single quotes'

I was asked to raise this issue by Metadaddy on Ask Streamsets.

I have a directory origin reading IIS log files using a regular expression.

All seems to work as expected, until you attempt to reference a field by its name. It took me a while, but I now realise that the field names are being enclosed in single quotes.

So in stead of /date, I'm getting /'/date'!

I have attached a sample pipeline, screenshot of the issue and sample data.

The workaround for this issue is documented where this issue originated:

https://ask.streamsets.com/question/6465/directory-origin-producing-field-names-enclosed-in-single-quotes/