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regex: add cheatsheet #209

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regex: add cheatsheet #209

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f53647e
Add regex cheatsheets:
Dec 5, 2022
f76135c
Add classes definitions
Dec 5, 2022
a789eb3
Add alternative support
Dec 5, 2022
0dc9f6c
Clarify version of sed mentioned
Dec 5, 2022
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20 changes: 20 additions & 0 deletions regex
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---
tags: [ patterns ]
---

<char|pattern>? match 0..1 characters or patterns (`?` must be escaped in GNU sed BRE)
<char|pattern>* match 0..more characters or patterns
<char|pattern>+ match 1..more characters or patterns (`+` must be escaped in GNU sed BRE)

<char|pattern>{<count>} match `count` characters or patterns (`{` and `}` must be escaped in GNU sed BRE)
<char|pattern>{<from..to>} match `from`..`to` characters or patterns (`{` and `}` must be escaped in GNU sed BRE)

[<characters>] match any mentioned character
[^<characters>] match any not mentioned character

# We don't distinguish between single char patterns below and complex patterns:

^<pattern> match the beggining of a string
<pattern>$ match the end of a string

(<pattern1>|<pattern2>) match any of two patterns (`|` must be escaped in GNU sed BRE)