Template:cheatsheet-key
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Key
Based on Perl's standard quantifiers:
| bold {1} | Must be present exactly once |
| italic* | Match 0 or more times |
| Match 1 or more times | |
| ? | Match 1 or 0 times |
| [square brackets] | list of common values |
| (parentheses) | data format |
| # | comment |