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

Question

Mathematics

Kingston Goodwin

21 February, 22:11

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

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Answers (1)

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Camille Stanley · Answer 1

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]