Created SC2022 (markdown)

SC2022.md

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+# Note that c* does not mean "c followed by anything" in regex.
+
+### Problematic code:
+
+    grep 'foo*'
+
+when wanting to match `food` and `foosball`, but not `mofo` or `keyfob`. 
+
+### Correct code:
+
+    grep '^foo' 
+
+### Rationale:
+
+As a glob, `foo*` means "Any string starting with foo", e.g. `food` and `foosball`.
+
+As a regular expression, "foo*" means "f followed by 1 or more o's, anywhere", e.g. "mofo" or "keyfob". 
+
+This construct is way more common as a glob than as a regex, so ShellCheck notifies you about it.
+
+### Contraindications
+
+If you're aware of the above, you can ignore this message. If you'd like shellcheck to be quiet, use a [[directive]] or `'fo[o]*'`.