re2c — re2c 3.0 documentation
re2c is a free and open-source lexer generator for C/C++, Go and Rust with a focus on generating fast code. It compiles regular expression specifications to deterministic finite automata and encodes them in the form of conditional jumps in the target language. This approach is generally faster than table-based lexers, and the generated code is easier to debug and understand. A flexible user interf
Grok Constructor
What is this about? GrokConstructor is a helper for testing and incremental construction of regular expressions for the grok filter that parses logfile lines for Logstash. Logstash, part of the ELK-Stack, is a tool to collect log files from various sources, parse them into a JSON format and put them into one or more databases, index engines and so forth - often elasticsearch. In the simplest case
Test grok patterns
This tries to parse a set of given logfile lines with a given grok regular expression (based on Oniguruma regular expressions ) and prints the matches for named patterns for each log line. You can also apply a multiline filter first. Please enter some loglines for which you want to check a grok pattern, the grok expression that should match these, mark the pattern libraries you draw your patterns
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