Problem With parameterized paths

Hi, 

I have a simple REST API that exposes an operation to get an account as follows

GET /accounts/{account_id}

I have created a virtual API based on this API. While I can exercise actions with non-parameterized paths when I invoke the above action I receive a 500 response. 

Here is the request:

GET http://localhost:8088/accounts/1234 HTTP/1.1
Accept-Encoding: gzip,deflate
Authorization: *****
Content-Length: 0
Host: localhost:8088
Connection: Keep-Alive
User-Agent: Apache-HttpClient/4.5.2 (Java/15)

And response:

HTTP/1.1 500 Server Error
Date: Tue, 05 Jan 2021 12:16:33 GMT
Transfer-Encoding: chunked

I can see the following error in the error log:

• Tue Jan 05 12:16:33 GMT 2021: ERROR: got an exception while dispatching - returning a default 500 response
• Tue Jan 05 12:16:33 GMT 2021: ERROR: java.util.regex.PatternSyntaxException: named capturing group is missing trailing '>' near index 10 (?.*\n*.*) ^
• java.util.regex.PatternSyntaxException: named capturing group is missing trailing '>' near index 10
• (?.*\n*.*)
• ^
• at java.base/java.util.regex.Pattern.error(Pattern.java:2028)
• at java.base/java.util.regex.Pattern.groupname(Pattern.java:2967)
• at java.base/java.util.regex.Pattern.group0(Pattern.java:3013)
• at java.base/java.util.regex.Pattern.sequence(Pattern.java:2124)
• at java.base/java.util.regex.Pattern.expr(Pattern.java:2069)
• at java.base/java.util.regex.Pattern.compile(Pattern.java:1783)
• at java.base/java.util.regex.Pattern.(Pattern.java:1430)
• at java.base/java.util.regex.Pattern.compile(Pattern.java:1095)
• at com.eviware.soapui.impl.rest.mock.RestMockService.getTemplateValues(RestMockService.java:270)
• at com.eviware.soapui.impl.rest.mock.RestMockService.findMatchedOperation(RestMockService.java:255)
• at com.eviware.soapui.impl.rest.mock.RestMockService.findMatchingOperationWithExactPath(RestMockService.java:179)
• at com.eviware.soapui.impl.rest.mock.RestMockDispatcher.getMockResult(RestMockDispatcher.java:102)
• at com.eviware.soapui.impl.rest.mock.RestMockDispatcher.lambda$0(RestMockDispatcher.java:56)
• at com.eviware.soapui.model.support.HasMockResultsMockDispatcher.doDispatch(HasMockResultsMockDispatcher.java:90)
• at com.eviware.soapui.impl.rest.mock.RestMockDispatcher.dispatchRequest(RestMockDispatcher.java:56)
• at com.smartbear.servicev.core.engine.impl.soapui.SoapUIHttpVirt.getHttpVirtResponse(SoapUIHttpVirt.java:296)
• at com.smartbear.servicev.core.engine.impl.soapui.SoapUIHttpVirt.regularDispatch(SoapUIHttpVirt.java:262)
• at com.smartbear.servicev.core.engine.impl.soapui.SoapUIHttpVirt.regularDispatch(SoapUIHttpVirt.java:1)
• at com.smartbear.servicev.core.engine.impl.AbstractVirt.dispatch(AbstractVirt.java:145)
• at com.smartbear.servicev.core.model.http.impl.HttpVirtServerHandler.dispatch(HttpVirtServerHandler.java:151)
• at com.smartbear.servicev.core.model.http.impl.HttpVirtServerHandler.handle(HttpVirtServerHandler.java:77)
• at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
• at org.eclipse.jetty.server.Server.handle(Server.java:516)
• at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:388)
• at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:633)
• at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:380)
• at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:273)
• at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311)
• at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:105)
• at org.eclipse.jetty.io.ChannelEndPoint$1.run(ChannelEndPoint.java:104)
• at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
• at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
• at java.base/java.lang.Thread.run(Thread.java:832)

Is this a known issue with REST APIS?