Merge pull request #176 from tobyhodges/remove_custom_permalinks

make lesson suitable for teaching with locally-built (serverless) pages

Author: sharilaster

_extras/discuss.md

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-layout: page
 title: Discussion
-permalink: /discuss/
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 There are many ways to discuss Library Carpentry lessons:
 

_extras/guide.md

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-layout: page
-title: "Instructor Notes"
-permalink: /guide/
+title: Instructor Notes
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 ____
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 To teach regular expressions, instructors have used:
 
 - [slides](https://github.com/LibraryCarpentry/lc-data-intro/blob/gh-pages/files/regexslides.pdf) to quiz the audience on examples.
-- Pen and paper, to work through exercises before using a tool and to explain that there can be multiple answers to the same question. 
+- Pen and paper, to work through exercises before using a tool and to explain that there can be multiple answers to the same question.
 - Whiteboard with text examples and quized participants on regex approaches.
 - Online tools such as: [Regxr](https://regexr.com/), [regex101](https://regex101.com/), [rexegper](http://regexper.com/), [myregexp](http://myregexp.com/), or whichever service you prefer.
 - Used quiz/exercise files in [https://github.com/LibraryCarpentry/lc-data-intro/tree/gh-pages/files](https://github.com/LibraryCarpentry/lc-data-intro/tree/gh-pages/files).

index.md

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 layout: lesson
 root: .
+permalink: index.html
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-This Library Carpentry lesson introduces people with library- and information-related roles to working with data using regular expressions. The lesson provides background on the regular expression language and how it can be used to match and extract text and to clean data. 
+This Library Carpentry lesson introduces people with library- and information-related roles to working with data using regular expressions. The lesson provides background on the regular expression language and how it can be used to match and extract text and to clean data.
 
 > ## Teaching this lesson
 >

reference.md

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 layout: reference
-root: .
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 ## Regular Expression Cheat Sheet
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 - `?` matches when the preceding character appears zero or one time.
 - `{VALUE}` matches the preceding character the number of times define by VALUE; ranges can be specified with the syntax `{VALUE,VALUE}`.
 - `|` means or.
-

setup.md

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-layout: page
 title: Setup
-root: .
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 ### This lesson does not require any special setup.
 
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-