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We have a regexp /Java[^script]/.

Does it match anything in the string Java? In the string JavaScript?

Answers: no, yes.

  • In the script Java it doesn’t match anything, because [^script] means “any character except given ones”. So the regexp looks for "Java" followed by one such symbol, but there’s a string end, no symbols after it.

    alert( "Java".match(/Java[^script]/) ); // null
  • Yes, because the [^script] part matches the character "S". It’s not one of script. As the regexp is case-sensitive (no i flag), it treats "S" as a different character from "s".

    alert( "JavaScript".match(/Java[^script]/) ); // "JavaS"