Regular expression again

Question

Hi there
i'm using this regular expression:
String regexp = "(\\s+)\\di(\\s+)";
Pattern p = Pattern.compile(regexp,CASE_INSENSITIVE);
Matcher m = p.matcher(inputString);
clean = m.replaceAll(" ");
by which i'd like, given the following inputString:
"a da diapason di da_R_randomChars_DI_DA"
i want to obtain the following:
"diapason da__R_randomChars_DI_DA"
that's to say, to search for all occurrences of di,a,da char sequences that are followed by one or more white space or that follow one or more white space...
but it doesn't work...why?
where am I wrong?
thanks

Answer 1

1) Your capture groups are wrong
2) [] matches any of so da maches
da, a, d, di, i
     String inputString = "a da diapason di da_R_randomChars_DI_DA";
     String regexp = "\\s+(di|a|da)\\s+";
     Pattern p = Pattern.compile(regexp,Pattern.CASE_INSENSITIVE);
     Matcher m = p.matcher(inputString);
     String clean = m.replaceAll("");     
     System.out.println( inputString );
     System.out.println( clean );
     System.out.println( "diapason da_R_randomChars_DI_DA" );give you:
$ java Test
a da diapason di da_R_randomChars_DI_DA
a diapason da_R_randomChars_DI_DA
diapason da_R_randomChars_DI_DA
Which is almost there, but your regex matches at lest one space, not one space, or start of line.