java - 查找两个特定单词之间的字符串

Question

我有一个文本，我需要提取两个特定单词之间的数据，例如 Activity :和子 Activity :之间的数据。这是我的文字:

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: 

我想出了这段代码，但问题是这种模式曾经用于文字，但一旦我更改了文本，它就不再起作用了，任何人都有任何想法:

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)

Answer 1

这个表情有点过分了。另外，也可以对部分字符串执行find()，而不是对整个字符串执行ma​​tches()。 \\w 匹配单词字符，\\W 匹配非单词字符。因此 \\W|\\w 可以是 ..

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 \\b 作为单词边界，匹配/消耗 0 个字符，并检测单词边界。这也适用于文本开头的 Activity。虽然我不确定，但我已经转义了冒号 (:)，但 x:{2,3} 会匹配 xx 或 xxx .

<小时/>

正如 @Pshemo 评论的那样，您的代码原则上是正确的。数据可能未按预期到达。

改变

matcher.matches();

至

if (!matcher.matches)) {
    throw new IllegalStateException("No activity in: " + text);
}