UNIX for Dummies Questions & Answers

Of course it can be done with regex, you wrote it in the first post. The question is can it be done simpler? I think not.

Your definition of one regex is a bit arbitrary, as I think some things are not included in base regex, like egrep multi-pattern matching using () and |, where an outer super-regex call may be doing many simple-regex calls. A bad regex can really slow things, too, so sometimes three simple is much better than one ugly. Academic problems are fun, but real world solutions are worth dollars.

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---------- Post updated at 02:20 AM ---------- Previous update was at 02:16 AM ----------

Ruby

Code:

>> s = "cxxbxxc"
=> "cxxbxxc"
>> s["a"] and s["b"] and s["c"] and print "ok"
=> nil
>> s = "cxxbxxa"
=> "cxxbxxa"
>> s["a"] and s["b"] and s["c"] and print "ok"
ok=> nil
>> s = "axxbxxa"
=> "axxbxxa"
>> s["a"] and s["b"] and s["c"] and print "ok"
=> nil