Replacing all non-alphanumeric characters with empty strings

is there a way to completely replace any non-alphanumeric char with an empty string

i found something like this:

Code:

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return value.replaceAll("\\W", "");

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Code:

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return value.replaceAll("[\\W]|_", "");

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but i dont really understand what they both do, so can you explain them to me and what the difference is please

Have you read the documentation of java.util.regex.Pattern?

Here's another learning resource: Regular-Expressions.info - Regex Tutorial, Examples and Reference - Regexp Patterns

db