I have a text and I need to extract a data between two specific words for example between Activity: and Sub-Activity: . here is my text :
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:
and I came up with this code, but the problem is that this pattern used to word, but as soon as I chaged the text it doesnt work any more, anybody has any idea:
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;
}
it shows me the following error :
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)
The expression is a bit overdone. Also instead of a matches() for the entire string, one can do a find() for a part. \\\\w
matches a word character, and \\\\W
a non-word character. Hence \\\\W|\\\\w
could be .
.
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);
I have used \\\\b
for a word boundary, matching/consuming 0 characters, and detecting word boundaries. This also works for Activity
at the begin of text. I have escaped the colon ( :
) though I am unsure, but x:{2,3}
would match xx
or xxx
.
As @Pshemo commented, your code is in principle correct. Likely the data does not arrive as attended.
Change
matcher.matches();
to
if (!matcher.matches)) {
throw new IllegalStateException("No activity in: " + text);
}
Try this may help you
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());
}
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