[SOLVED] RegExp for whitespaces without tabs

RegExp for whitespaces without tabs

I am trying to build a parser for a sonar-plugin where the tokens can contain spaces and tabs in order to use them for implementing a checking rule for spaces. Therefore, I want to store them to different tokens.

I set the space and tab as TokenType:

    .withChannel(regexp(TokenType.TAB, "\t"))
    .withChannel(regexp(TokenType.WHITESPACE, "\\s"))

But, tabs are regarded as spaces tokens as well, because in Java the regexp for /s matches any white space character (space, tab, line break, carriage return)

What's the right regexp to discriminate tabs from spaces?

Solution

With:

.withChannel(new BlackHoleChannel("\n"))        //removes newlines from source code
.withChannel(regexp(TclTokenType.TAB, "\t"))    //matches tabs
.withChannel(regexp(TokenType.WHITESPACE," "))  //matches spaces

Spaces are matched correctly, and tabs are recognized. The key is on the BlackHoleChannel.

^{This is FILIaS's solution from revision 15 of the question.}