Learn Java Programming - Regex Predefined Character Classes Tutorial
Often times you will find yourself using the same character class expression over and over again. A regex character pattern such as [0-9] represents digits only, specifically the numbers 0 through 9. An expression such as this is used so often, the regex architects decided to make a shorthand metacharacter for just such an occasion: \d. The regex string literal "[0-9]" is functionally identical to "\\d". Predefined Character Classes are essentially just extensions of the standard metacharacters. Before continuing with this tutorial, I highly recommend that you watch my Regex Character Classes Part 1 Tutorial , Regex Character Classes Part 2 Tutorial, and my Regex Metacharacters Tutorial.
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