Update cheatsheets

grex

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# grex
+
+> Generate regular expressions.
+> More information: <https://github.com/pemistahl/grex>.
+
+- Generate a simple regular expression:
+
+`grex {{space_separated_strings}}`
+
+- Generate a case-insensitive regular expression:
+
+`grex -i {{space_separated_strings}}`
+
+- Replace digits with '\d':
+
+`grex -d {{space_separated_strings}}`
+
+- Replace Unicode word character with '\w':
+
+`grex -w {{space_separated_strings}}`
+
+- Replace spaces with '\s':
+
+`grex -s {{space_separated_strings}}`
+
+- Add {min, max} quantifier representation for repeating sub-strings:
+
+`grex -r {{space_separated_strings}}`