Rantly#string(char_class) でランダムな文字列データを作ります。
char_classの指定内容によって出力する文字列の内容を選択できます。
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サンプル
Rantly(5){string}
# => ["gxX^ +", "fn@fXU", "Qct7{\"", "*j=XcD", "'a;@1k"]
Rantly(5){string}
# => ["GjOHTb", "s\"dV.+", "zE1i)t", "{teu=u", "Wvm/7U"]
Rantly(5){string(:lower)}
# => ["vovzuy", "lxbxue", "uudmkh", "sogody", "uritkw"]
Rantly(5){string(:lower)}
# => ["ndopxb", "pkxxeo", "xoeoml", "ntocio", "vbpmnp"]
# char_class を確認
Rantly::Chars::CLASSES.keys
# => [:alnum, :alpha, :blank, :cntrl, :digit, :graph, :lower, :print, :punct, :space, :upper, :xdigit, :ascii]