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Description

Inside square brackets "[]" a list of characters can be provided. The expression matches if any of these characters is found. The order of characters is insignificant.(Case 3)

Source

How do you do?

Case 1

Regular Expression: [oyu]
First match:How do you do?
All matches:How do you do?

Case 2

Regular Expression: [dH].
First match:How do you do?
All matches:How do you do?

Case 3

Regular Expression: [owy][yow]
First match:How do you do?
All matches:How do you do?