「,」「空白」を除いた状態で検索結果が表示したい

以下のコードでEclipseで起動すると
結果は
「一致した部分は : reading,but
一致した部分は : Rabbit
一致した部分は : remarkable in that
一致した部分は : Rabbit
一致した部分は : Rabbit
一致した部分は : rabbit
一致した部分は : ran across the field after it
一致した部分は : rabbit
と表示されますが、
「reading,but」「remarkable in that」「ran across the field after it」の３つをよく見ると
「,」「空白」が正規表現で引っかかってしまいます。

以下の２つの正規表現でやってみましたが
今度は何も引っかかりませんでした。

Strnig regex＝"^r.*t$"；
String regex1="^R.*t$";

rで始まりtで終わる単語のこの他に使える正規表現を教えてください。

Java
1import java.util.regex.Matcher;
2import java.util.regex.Pattern;
3
4public class Main {
5
6	public static void main(String[] args) {
7		String regex = "\br.*?t\b";
8		//rで始まりｔで終わる正規表現
9		Pattern p = Pattern.compile(regex, Pattern.CASE_INSENSITIVE);
10		//Pattern.CASE_INSENSITIVE は大文字と小文字を無視する
11		Matcher m = p.matcher(text);
12		/*変数Pの条件でtextを正規表現検索する*/
13		while (m.find()) {
14			System.out.println("一致した部分は : " + m.group());
15		}
16	}
17
18public static String text =  "Alice was beginning to get very tired of sitting by "  + "her sister on the bank, and of having nothing to do: once or "  + "twice she had peeped into the book her sister was reading, but "  + "it had no pictures or conversations in it, `and what is the use "  + "of a book,\' thought Alice `without pictures or conversation?\'\n"  + "So she was considering in her own mind (as well as she could, "  + "for the hot day made her feel very sleepy and stupid), whether "  + "the pleasure of making a daisy-chain would be worth the trouble "  + "of getting up and picking the daisies, when suddenly a White "  + "Rabbit with pink eyes ran close by her.\nThere was nothing so "  + "very remarkable in that; nor did Alice think it so very much "  + "out of the way to hear the Rabbit say to itself, `Oh dear! "  + "Oh dear! I shall be late!\' (when she thought it over afterwards, "  + "it occurred to her that she ought to have wondered at this, but "  + "at the time it all seemed quite natural); but when the Rabbit "  + "actually took a watch out of its waistcoat-pocket, and looked "  + "at it, and then hurried on, Alice started to her feet, for it "  + "flashed across her mind that she had never before seen a rabbit "  + "with either a waistcoat-pocket, or a watch to take out of it, "  + "and burning with curiosity, she ran across the field after it, "  + "and fortunately was just in time to see it pop down a large "  + "rabbit-hole under the hedge.";
19