RegExp for whitespaces without tabs

Question

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?

check http://stackoverflow.com/questions/3583111/regular-expression-find-spaces-tabs-space-but-not-newlines and just turn it around — MoRe, Jan 15 '14 at 13:30
In my case, I need separate regexp and simply "[ ]" doesn't work for me :/ — FILIaS, Jan 15 '14 at 13:35

MoRe · Answer 1 · 2014-01-15T14:26:19.410

3

I'm not familiar with the TokenType syntax but to get all the whitespace without tabs you could use:

[ \n\x0b\r\f]

Because \s is just a short form of writing [ \t\n\x0B\f\r]. Refer to the documentation.

edited Jan 15 '14 at 14:26

answered Jan 15 '14 at 13:50

MoRe

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It's not a valid syntax for TokenType but regardless that in my case I don't even need newlines or end of lines just whitespaces, but the "[ ]" doesn't do my job – FILIaS Jan 15 '14 at 14:17
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So what you call whitespaces means _spaces_? – MoRe Jan 15 '14 at 14:25

score 2 · Accepted Answer · edited May 23 '17 at 10:28

2

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.}

edited May 23 '17 at 10:28

Community

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answered Jan 15 '14 at 16:45

The Guy with The Hat

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RegExp for whitespaces without tabs

2 Answers2