Google Classroom Grades Filter

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*** Please upgrade to my Google Classroom Tweaks extension ***
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This new extension includes all of the functionality in this one plus several more features that (IMHO) that are really helpful. For more info, see https://chrome.google.com/webstore/detail/google-classroom-tweaks/ajidehkdcfndgeeejbnfeikngkidcdfm?hl=en&authuser=0

NB - I will not be posting any more updates to this extension. All new work will go into my Google Classroom Tweaks extension.
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This extension allows you to filter the columns in your Google Classroom Grades table - e.g., view just the tests or just the quizzes or work that was due in Dec, etc., etc,

New in v0.1.5, you can
1. Removed unused Storage permission in manifest (to comply with Google requirements). Otherwise, no changes.

New in v0.1.4, you can
1. specify whether to include or exclude the matching columns, and
2. enter more complex search patterns - e.g., enter `sep|oct` to match entries from `September` or `October`... use the Vertical Line (+`\`) to specify a logical `OR`

In actual fact, the field supports full regular expression matching if you want to get that complex!