exrex: add page (#5296)

pages/common/exrex.md

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+# exrex
+
+> Generate all/random matching strings for a regular expression.
+> It can also simplify regular expressions.
+> More information: <https://github.com/asciimoo/exrex>.
+
+- Generate all possible strings that match a regular expression:
+
+`exrex '{{regular_expression}}'`
+
+- Generate a random string that matches a regular expression:
+
+`exrex --random '{{regular_expression}}'`
+
+- Generate at most 100 strings that match a regular expression:
+
+`exrex --max-number {{100}} '{{regular_expression}}'`
+
+- Generate all possible strings that match a regular expression, joined together by a custom delimiter string:
+
+`exrex --delimiter "{{, }}" '{{regular_expression}}'`
+
+- Print count of all possible strings that match a regular expression:
+
+`exrex --count '{{regular_expression}}'`
+
+- Simplify a regular expression:
+
+`exrex --simplify '{{ab|ac}}'`
+
+- Print eyes:
+
+`exrex '{{[oO0](_)[oO0]}}'`
+
+- Print a boat:
+
+`exrex '{{( {20}(\| *\\|-{22}|\|)|\.={50}| ( ){0,5}\\\.| {12}~{39})}}'`