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An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.
  • All Tokens
  • Common Tokens
  • General Tokens
  • Anchors
  • Meta Sequences
  • Quantifiers
  • Group Constructs
  • Character Classes
  • Flags/Modifiers
  • Substitution
  • A single character of: a, b or c
    [abc]
  • A character except: a, b or c
    [^abc]
  • A character in the range: a-z
    [a-z]
  • A character not in the range: a-z
    [^a-z]
  • A character in the range: a-z or A-Z
    [a-zA-Z]
  • Any single character
    .
  • Alternate - match either a or b
    a|b
  • Any whitespace character
    \s
  • Any non-whitespace character
    \S
  • Any digit
    \d
  • Any non-digit
    \D
  • Any word character
    \w
  • Any non-word character
    \W
  • Non-capturing group
    (?:...)
  • Capturing group
    (...)
  • Zero or one of a
    a?
  • Zero or more of a
    a*
  • One or more of a
    a+
  • Exactly 3 of a
    a{3}
  • 3 or more of a
    a{3,}
  • Between 3 and 6 of a
    a{3,6}
  • Start of string
    ^
  • End of string
    $
  • A word boundary
    \b
  • Non-word boundary
    \B

Regular Expression
Processing...

Test String

Code Generator

Language

Generated Code

import re regex = re.compile(r"^(?<time>\d+(?:-\d+){2}\s+\d+(?::\d+){2}\.\d+)\s*(?<level>\S+) (?<pid>\d+) --- \[(?<thread>[\s\S]*?)\] (?<class>\S+)\s*:\s*(?<message>[\s\S]*?)(?=\g<time>|\Z)", flags=re.MULTILINE) test_str = ("2018-06-26 09:01:42.144 DEBUG 1 --- [io-9090-exec-10] c.stakater.gateway.logging.MethodLogger : Method called: StackService.fetchStack(..)\n" "2018-06-26 09:01:42.149 ERROR 1 --- [io-9090-exec-10] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.RuntimeException: Stack with ID: 166a998f-dbb2-44a3-be86-asd Not Found!] with root cause\n" " java.lang.RuntimeException: Stack with ID: 166a998f-dbb2-44a3-be86-asd Not Found!\n" " at com.stakater.gateway.repository.StackRepositoryService.findById(StackRepositoryService.java:29) ~[classes!/:1.0.16]\n" " at com.stakater.gateway.repository.StackRepositoryService$$FastClassBySpringCGLIB$$fe7f2cc7.invoke(&lt;generated&gt;) ~[classes!/:1.0.16]\n" " at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) ~[spring-core-4.3.12.RELEASE.jar!/:4.3.12.RELEASE]\n" " at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:738) ~[spring-aop-4.3.12.RELEASE.jar!/:4.3.12.RELEASE]\n" " at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) ~[spring-aop-4.3.12.RELEASE.jar!/:4.3.12.RELEASE]\n" " at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99) ~[spring-tx-4.3.12.RELEASE.jar!/:4.3.12.RELEASE]\n" " at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282) ~[spring-tx-4.3.12.RELEASE.jar!/:4.3.12.RELEASE]\n" " at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) ~[spring-tx-4.3.12.RELEASE.jar!/:4.3.12.RELEASE]\n" " at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.12.RELEASE.jar!/:4.3.12.RELEASE]\n" " at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:673) ~[spring-aop-4.3.12.RELEASE.jar!/:4.3.12.RELEASE]\n" " at com.stakater.gateway.repository.StackRepositoryService$$EnhancerBySpringCGLIB$$ddd17ba6.findById(&lt;generated&gt;) ~[classes!/:1.0.16]\n" " at com.stakater.gateway.service.StackService.fetchStack(StackService.java:118) ~[classes!/:1.0.16]\n" " at com.stakater.gateway.service.StackService$$FastClassBySpringCGLIB$$97e6baa6.invoke(&lt;generated&gt;) ~[classes!/:1.0.16]\n" " at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) ~[spring-core-4.3.12.RELEASE.jar!/:4.3.12.RELEASE]\n" " at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:738) ~[spring-aop-4.3.12.RELEASE.jar!/:4.3.12.RELEASE]\n" " at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) ~[spring-aop-4.3.12.RELEASE.jar!/:4.3.12.RELEASE]\n" " at org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:52) ~[spring-aop-4.3.12.RELEASE.jar!/:4.3.12.RELEASE]\n" " at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.12.RELEASE.jar!/:4.3.12.RELEASE]\n" " at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) ~[spring-aop-4.3.12.RELEASE.jar!/:4.3.12.RELEASE]\n" "2018-06-26 09:01:42.144 DEBUG 1 --- [io-9090-exec-10] c.stakater.gateway.logging.MethodLogger : Method called: StackService.fetchStack(..)") matches = regex.finditer(test_str) for match_num, match in enumerate(matches, start=1): print(f"Match {match_num} was found at {match.start()}-{match.end()}: {match.group()}") for group_num, group in enumerate(match.groups(), start=1): print(f"Group {group_num} found at {match.start(group_num)}-{match.end(group_num)}: {group}")

Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Python, please visit: https://docs.python.org/3/library/re.html