Java

Validating Strings as Alphanumeric Using Regex in Java

2025-04-30

To validate alphanumeric characters using regular expressions, use ^[a-zA-Z0-9]+$. This pattern matches strings composed of one or more alphanumeric characters, such as "3DModel".

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Retrieve a substring from the end in Java

2025-04-02

To extract a substring in Java, use the substring method of the String class. By specifying the start index as the length of the original string minus the length of the substring, you can extract a substring from the end of the string.

photo by：Justin Kauffman

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