java 正则表达式有点让我很郁闷
Pattern p3 = Pattern.compile("a??");
Matcher m3 = p3.matcher("a");
while (m3.find()) {
System.out.println(m3.group());
System.out.println(m3.start()+" "+m3.end());
}
输出为0 01 1我认为应该还输出
a
0 1
求助正则表达式java
Pattern p3 = Pattern.compile("a??");
Matcher m3 = p3.matcher("a");
while (m3.find()) {
System.out.println(m3.group());
System.out.println(m3.start()+" "+m3.end());
}
输出为0 01 1我认为应该还输出
a
0 1
求助正则表达式java
Pattern.compile("(a?)")