How can I add an underscore before each capital letter inside a Java String? -

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I have a string like "HelloWorldMyNameIsCarl" and I want to create something like "Hello_World_My_Name_Is_Carl". How can I do this?

Yes, regular expressions can do this for you:

< [AZ ] "HelloWorldMyNameIsCarl" .replaceAll ("(. ((.) ([AZ])", "$ 1_ $ 2")

expression [AZ] will match each upper case sheet and it will be inserted into another group. To avoid changing the first 'H' you have to first group . is required.

As mentioned, this solution does not work for arbitrary language. To capture any uppercase letters defined by Unicode Stargard, we need the \ p {Lu} which matches all the uppercase letters, therefore the more general solution 

  "HelloWorldMyNameIsCarl" .replaceAll ("(.) (\\ p {Lu})", "$ 1_ $ 2") appears

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