Regex java exception exclude "Caused by:"
I am trying to capture the Java exception anem from a log file, but I would like to exclude the "Caused by:" string using Oniguruma Regular Expressions Version 6.0.0:
^.+Exception
returns:
"Caused by: java.nio.file.NoSuchFileException"
How can I write a regular expression which captures the exception name but ignores the "Caused by: " string in front of it? This will be used in Grok Logstash.
You may use capturing with the following pattern:
^Caused\s*by:\s*(?<exception>[\w.]+)
The (?<exception>[\w.]+) named capturing group will match and capture into Group "exception" (creating the variable with the same name) 1+ word (letters, digits or underscores) or . chars.
Answering your question, to check and require something but excluding it from the match, you may use lookarounds:
(?<=^Caused by: ).*?Exception
See this Rubular demo. And below is a test at https://grokdebug.herokuapp.com/:
- Eliminate meaningless words from a block of text
- JavaScript Split String with regex - match (how to replace match regex into split function)
- "Begins with" in Twig template
- Regular Expression Tester for Google RE2
- Perl's capture group disappears while in scope
- RegEx to find string representing local paths
- Character limit in a regular expression Javascript
- How do I create a regex dynamically using strings in a list for use in a pandas dataframe search?
- Remove non-utf8 characters from string
- Non greedy (reluctant) regex matching in sed?
- Regex to substitute the next two words after a matching point
- Expressing basic Access query criteria as regular expressions
- Regex to match email addresses, and common obfuscations
- Regular expression isn't matching all hyperlinks in a string
- How to scrape iframe content using cURL
- How to use a regular expression in a jQuery selector?
- How to getElementByName() with a regex?
- Regular expressions with O(N) and backreferences support
- Split a string by commas which are not inside potentially nested parentheses
- Split a string on commas which are followed by a space, word, then a colon
- How to not match (negative match) certain patterns in lookbehind
- Notepad++ and regex: how to UPPERCASE specific part of a string / find / replace
- Remove duplicated words from a space delimited string
- How to understand the star quantifier (*) output
- shell script: search and replace over multiple lines
- Regex pattern to replace any occurrence of {...} with actual values
- Split string on dots unless the dot is inside double quotes
- Get all alphanumeric words with length of either 4 or 12 characters
- Replace the trailing digits of a URI with corresponding slug text
- Wrap <b> tags around substrings matching a regular expression