Add regex

src/dev/regex/main.md

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+# Regex
+
+## Non capturing group
+
+- 8 cats
+- 9 dogs
+- 10 cows
+
+Match and capture **ONLY** the number of cats and dogs using ?:, for _non capturing_ groups
+
+```txt
+(\d+) (?:cats|dogs)
+```