我正在尝试将Hearst-Patterns与Java正则表达式匹配这是我的正则表达式:
<np>(\w+)<\/np> such as (?:(?:, | or | and )?<np>(\w+)<\/np>)*
如果我有一个带注释的句子,如:
I have a <np>car</np> such as <np>BMW</np>, <np>Audi</np> or <np>Mercedes</np> and this can drive fast.
我想得到这些小组:
1. car
2. [BMW, Audi, Mercedes]
更新:这是我当前的java代码:
Pattern pattern = Pattern.compile("<np>(\\w+)<\\/np> such as (?:(?:, | or | and )?<np>(\\w+)<\\/np>)*");
Matcher matcher = pattern.matcher("I have a <np>car</np> such as <np>BMW</np>, <np>Audi</np> or <np>Mercedes</np> and this can drive fast.");
while (matcher.find()) {
System.out.println(matcher.group(1));
System.out.println(matcher.group(2));
}
但是第二组元素只包含Mercedes
,如何获得第二组的所有匹配(maby作为数组)?这可能是java Pattern
和Matcher
吗?如果是的话,我的错误是什么?
答案 0 :(得分:2)
如果你想确保有连续的结果,你可以使用强制匹配的\G
锚点与先前的匹配相邻:
Pattern p = Pattern.compile("<np>(\\w+)</np> such as|\\G(?:,| or| and)? <np>(\\w+)</np>");
注意:\G
锚意味着先前匹配的结束或字符串的开头。为避免匹配字符串的开头,您可以在(?<!^)
\G