[英]Regular expression does not match
I need to define a pattern for a string and find all matches of that in a sentence in java eclipse environment. 我需要为字符串定义一个模式,并在java eclipse环境中的句子中找到该模式的所有匹配项。 This in my code: 这在我的代码中:
public static final String EXAMPLE_TEST = "MD_pos ";
public static final String REGEX ="(RB_pos)?(MD_pos|VB_pos|VBD_pos|VBP_pos|VBZ_pos|VBG_pos|VBN_pos) (RP_pos)? (RB_pos)? ";
public void PatMat() {
Pattern pattern = Pattern.compile(REGEX);
Matcher matcher = pattern.matcher(EXAMPLE_TEST);
int count = 0;
while(matcher.find()) {
count++;
System.out.println("found: " + count + " : "
+ matcher.start() + " - " + matcher.end());
System.out.println("found: " + matcher.group());
}
}
Parts with ?
零件有?
sign in pattern are optional so MD_pos
should be matched. 登录模式是可选的,因此应匹配MD_pos
。 But everytime I call this method there is no result in console. 但是每次我调用此方法时,控制台中都没有结果。
您的REGEX
包含三个非可选的空格,这些空格在您尝试匹配的示例字符串中不存在。
您忘记了在COMMENTS
模式下进行编译,因此忽略了空格。
Pattern pattern = Pattern.compile(REGEX, Pattern.COMMENTS);
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