substr: ${substr_10:abc}
str2b64:${str2b64:abcd}
str2b64:${str2b64:The quick brown \n fox}
+base64: ${base64:abcd}
+base64: ${base64:The quick brown \n fox}
+base64d:${base64d:YWJjZA==}
+base64d:${base64d:VGhlIHF1aWNrIGJyb3duIAogZm94}
strlen: ${strlen:}
strlen: ${strlen:a}
strlen: ${strlen:abcdefgh}
${extract{ }{X=3}}
${extract{ 2 }{ }{a b c}}
+${map{a,1:b,2:c,3}{${extract{1}{,}{$item}{$value}{}}}}
+${map{a,1:b,2:c,3}{${extract{1}{,}{$item}{$value}{failcase}{bogus_argument}}}}
+${map{a,1:b,2:c,3}{${extract{1}{,}{$item}{$value}fail}}}
+
# Translation
abcdea aaa xyz ${tr{abcdea}{aaa}{xyz}}