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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. class Ideone
  6. {
  7. 	public static void main (String[] args) throws java.lang.Exception
  8. 	{
  9. 		String p = "^file:/(?!/)";
  10. 		System.out.println("file:/qq".replaceFirst(p, "file://"));
  11. 		System.out.println("file://qq".replaceFirst(p, "file://"));
  12. 	}
  13. }
Success #stdin #stdout 0.1s 27964KB
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stdin
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Standard input is empty
stdout
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file://qq
file://qq
https://ideone.com/fj6rd6
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
secret

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