Java 在两个特定单词之间查找字符串

我有一个文本，需要提取两个特定单词之间的数据，例如活动：和子活动：。以下是我的文字：

Activity: S1. Outline Design
Sub-Activity: S3.3 Walk through Release Backlog
Question Tag: tag
Questioner (role or team): Solution Architect
Which response should the user read first?: Response 8
Responder 1 (role or team): Developer
Response 1: 
Responder 2 (role or team): Scrum Master
Response 2: response2
Responder 3 (role or team): Please select:
Response 3: 
Responder 4 (role or team): Please select:
Response 4: 
Responder 5 (role or team): Please select:
Response 5: 

我提出了这段代码，但问题是这个模式用于word，但一旦我修改了文本，它就不再起作用了，任何人都知道：

private static String extractActivity(String text) {
    Pattern pattern = Pattern.compile("(?:\\W|\\w)*Activity:(?:\\W)*(.*)(?:\\W)*Sub-Activity:(?:\\W|\\w)*",
            Pattern.DOTALL);
    Matcher matcher = pattern.matcher(text);
    matcher.matches();
    String activities = matcher.group(1);
    return activities;
}

它向我显示了以下错误：

Feb 19, 2014 5:06:58 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [default-dispatcher] in context with path [/webmi] threw exception [Request processing failed; nested exception is java.lang.IllegalStateException: No match found] with root cause
java.lang.IllegalStateException: No match found
    at java.util.regex.Matcher.group(Matcher.java:485)
    at com.lloydsbanking.webmi.service.RSSReaderService.extractSubActivity(RSSReaderService.java:107)
    at com.lloydsbanking.webmi.service.RSSReaderService.read(RSSReaderService.java:61)
    at com.lloydsbanking.webmi.web.RssController.getFeed(RssController.java:34)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:920)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:827)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:801)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:176)
    at org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:145)
    at org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:92)
    at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:394)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at com.lloydsbanking.webmi.web.VersionNumberFilter.doFilter(VersionNumberFilter.java:50)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at com.opensymphony.sitemesh.webapp.SiteMeshFilter.obtainContent(SiteMeshFilter.java:129)
    at com.opensymphony.sitemesh.webapp.SiteMeshFilter.doFilter(SiteMeshFilter.java:77)

---

这个表达有点夸张。也可以对部分执行查找（），而不是对整个字符串执行匹配（）

\\w

匹配单词字符，而

\\w

匹配非单词字符。因此，

\\W |\\W

可能是

Pattern pattern = Pattern.compile("\\bActivity\\:(.*)\\bSub-Activity\\:",
        Pattern.DOTALL);
Matcher matcher = pattern.matcher(text);
if (matcher.find()) {
    String activities = matcher.group(1);
    return activities;
}
throw new IllegalStateException("No activity in: " + text);

我使用了

\\b

作为单词边界，匹配/使用0个字符，并检测单词边界。这也适用于文本开头的

活动

。 虽然我不确定，但是我已经逃出了冒号（

：

），但是

x:{2,3}

将匹配

xx

或

xxx

---

正如@Pshemo所评论的，您的代码原则上是正确的。很可能数据未按要求送达

改变

matcher.matches();

到

试试这个也许对你有帮助

 public static void main(String[] args){
    String str = "Activity: S1. Outline Design Sub-Activity: S3.3 Walk through " +
    "Release Backlog Question Tag: tag Questioner (role or team): Solution " +
    "Architect Which response should the user read first?: Response 8 Responder" +
    " 1 (role or team): Developer Response 1: Responder 2 (role or team): Scrum " +
    "Master Response 2: response2 Responder 3 (role or team):"+
    "Please select: Response 3: Responder 4 (role or team): Please select: Response 4:" +
    " Responder 5 (role or team): Please select: Response 5:";

    String regex = "(?<=Activity:).*?(?=Sub-Activity:)";

    Pattern pattern = Pattern.compile(regex);
    Matcher matcher = pattern.matcher(str);
    matcher.find();
    System.out.println(matcher.group());
}

publicstaticvoidmain（字符串[]args）{
String str=“活动：S1.大纲设计子活动：S3.3演练”+
“发布待办事项问题标签：标签提问者（角色或团队）：解决方案”+
“架构师用户应首先读取哪个响应？：响应8响应者”+
“1（角色或团队）：开发人员响应1：响应者2（角色或团队）：Scrum”+
“主响应2：响应2响应者3（角色或团队）：”+
“请选择：响应3：响应者4（角色或团队）：请选择：响应4：”+
“响应者5（角色或团队）：请选择：响应5:”；
字符串正则表达式=”（？如果您更改了文本，请更改正则表达式以适应输入和您的要求。您需要提供一些您希望与此输入匹配的逻辑。我想阅读这两个词之间的所有内容。我无法重现您的问题。您的代码和此数据对我来说很好。您能否更详细地描述
它不再有效
 部分？我刚刚添加了我得到的错误，但昨天我测试了txt中的任何单词的代码，它在finr中工作，但我不知道为什么它不再工作了，即使在这个网站上它不再工作了，这是一个很好的改进，但id似乎没有解决异常，因为regex被
包围（？：\\W|\\W）*
，如果至少有一个匹配项，将允许正则表达式匹配整个字符串。
 public static void main(String[] args){
    String str = "Activity: S1. Outline Design Sub-Activity: S3.3 Walk through " +
    "Release Backlog Question Tag: tag Questioner (role or team): Solution " +
    "Architect Which response should the user read first?: Response 8 Responder" +
    " 1 (role or team): Developer Response 1: Responder 2 (role or team): Scrum " +
    "Master Response 2: response2 Responder 3 (role or team):"+
    "Please select: Response 3: Responder 4 (role or team): Please select: Response 4:" +
    " Responder 5 (role or team): Please select: Response 5:";

    String regex = "(?<=Activity:).*?(?=Sub-Activity:)";

    Pattern pattern = Pattern.compile(regex);
    Matcher matcher = pattern.matcher(str);
    matcher.find();
    System.out.println(matcher.group());
}