# exrex > Generate all/random matching strings for a regular expression. > It can also simplify regular expressions. > More information: . - 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 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})}}'`