Devs268 Devs268

25-06-2017
Mathematics

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Using wildcard metacharacters, how can one indicate a number is either 1, 2, 3, or 4?

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mathmate mathmate

25-06-2017

using the current "regular expressions" in use in Java, Perl, and many other applications, this belongs to "character class" using the [ ] notation.
For characters "either" 1,2,3,4, we write
[1234]
or in this particular case,
[1-4]

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