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Lightweight log filtering tool supporting regular expressions and instant (as-you-type) results.
C++ Swift C
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PeculiarLog.xcodeproj Initial commit. Dec 18, 2019
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Peculiar Log

PeculiarLog is a lightweight log filtering tool supporting regular expressions and instant (as-you-type) results.

It is designed to work with huge multi-gigabyte text files utilizing the power of Intel Hyperscan engine running on multiple CPU cores.


You can find most recent compiled version here


Since PeculiarLog is based on Intel Hyperscan engine it is expecting headers to be available at /usr/local/opt/hyperscan/include/hs and libhs.a located at /usr/local/lib

Brew is the easiest way to install Hyperscan engine.

$ brew install hyperscan


When everything is set, open Xcode project to build PeculiarLog from source. Minimum requirements - Xcode 9 and Swift 4.1.

AVX512 support

In order to make it even faster on host with AVX512 instructions it is necessary to rebuild HyperScan with the following options.

$ mkdir build
$ cd build
$ make

Then link new libhs.a to the project or replace the one installed with Brew.


Just open app, drag log file to the icon and start typing regex in the field. Use setting panel or shortcuts to change scope, toggle caseless regex or line numbers.


There are several limitation applied to the supported regex patterns by Hyperscan.

Hyperscan supports the pattern syntax used by the PCRE library (“libpcre”), 
described at <>. However, not all constructs available 
in libpcre are supported. The use of unsupported constructs will result in 
compilation errors.

The version of PCRE used to validate Hyperscan’s interpretation of this 
syntax is 8.41 or above.


⇧ ⌃ ↑  - increase 'before' scope
⇧ ⌃ ↓  - decrease 'before' scope
⇧ ⌘ ↑  - decrease 'after' scope 
⇧ ⌘ ↓  - increase 'after' scope 
⇧ ⌘ c  - toggle caseless regex
⇧ ⌘ l  - toggle line numbers

There is also a hint on the right side of a settings panel.



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