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Rich-text area for JavaFX
There is a newer version: 0.11.3
package org.fxmisc.richtext;

import java.text.BreakIterator;
import java.util.Collection;

import javafx.beans.NamedArg;
import org.fxmisc.richtext.model.EditableStyledDocument;

/**
 * A convenience subclass of {@link StyleClassedTextArea} with fixed-width font and an undo manager that observes
 * only plain text changes (not styled changes). It's style class is {@code code-area}.
 */
public class CodeArea extends StyleClassedTextArea {

    {
        getStyleClass().add("code-area");

        // load the default style that defines a fixed-width font
        getStylesheets().add(CodeArea.class.getResource("code-area.css").toExternalForm());

        // don't apply preceding style to typed text
        setUseInitialStyleForInsertion(true);
    }
    
    /**
     * Creates an area that can render and edit the same {@link EditableStyledDocument} as another {@link CodeArea}.
     */
    public CodeArea(@NamedArg("document") EditableStyledDocument, String, Collection> document) {
        super(document, false);
    }

    /**
     * Creates an area with no text.
     */
    public CodeArea() {
        super(false);
    }

    /**
     * Creates a text area with initial text content.
     * Initial caret position is set at the beginning of text content.
     *
     * @param text Initial text content.
     */
    public CodeArea(@NamedArg("text") String text) {
        this();

        appendText(text);
        getUndoManager().forgetHistory();
        getUndoManager().mark();

        // position the caret at the beginning
        selectRange(0, 0);
    }
    
    @Override // to select words containing underscores
    public void selectWord()
    {
        if ( getLength() == 0 ) return;

        CaretSelectionBind csb = getCaretSelectionBind();
        int paragraph = csb.getParagraphIndex();
        int position = csb.getColumnPosition(); 
        
        String paragraphText = getText( paragraph );
        BreakIterator breakIterator = BreakIterator.getWordInstance( getLocale() );
        breakIterator.setText( paragraphText );

        breakIterator.preceding( position );
        int start = breakIterator.current();
        
        while ( start > 0 && paragraphText.charAt( start-1 ) == '_' )
        {
            if ( --start > 0 && ! breakIterator.isBoundary( start-1 ) )
            {
                breakIterator.preceding( start );
                start = breakIterator.current();
            }
        }
        
        breakIterator.following( position );
        int end = breakIterator.current();
        int len = paragraphText.length();
        
        while ( end < len && paragraphText.charAt( end ) == '_' )
        {
            if ( ++end < len && ! breakIterator.isBoundary( end+1 ) )
            {
                breakIterator.following( end );
                end = breakIterator.current();
            }
            // For some reason single digits aren't picked up so ....
            else if ( Character.isDigit( paragraphText.charAt( end ) ) )
            {
                end++;
            }
        }
        
        csb.selectRange( paragraph, start, paragraph, end );
    }
}