public class TheReplacements {
/*! Here's a block of text to use as input to
the regular expression matcher. Note that we'll
first extract the block of text by looking for
the special delimiters, then process the
extracted block. !*/
public static void main(String[] args) throws Exception {
String s = TextFile.read("src/com/strings/TheReplacements.java");
System.out.println(s);
// Match the specially commented block of text above:
Matcher mInput =
Pattern.compile("/\*!(.*)!\*/", Pattern.DOTALL)
.matcher(s);
if (mInput.find())
s = mInput.group(1); // Captured by parentheses
// Replace two or more spaces with a single space:
s = s.replaceAll(" {2,}", " ");
// Replace one or more spaces at the beginning of each
// line with no spaces. Must enable MULTILINE mode:
s = s.replaceAll("(?m)^ +", "");
System.out.println(s);
s = s.replaceFirst("[aeiou]", "(VOWEL1)");
StringBuffer sbuf = new StringBuffer();
Pattern p = Pattern.compile("[aeiou]");
Matcher m = p.matcher(s);
// Process the find information as you perform the replacements:
while (m.find())
m.appendReplacement(sbuf, m.group().toUpperCase());
// Put in the remainder of the text:
m.appendTail(sbuf);
System.out.println(sbuf);
}
}
上段代码将Pattern.DOTALL去掉运行结果会发生变化，不是很理解。为什么啊？？
