Phillip Cloud commented on ARROW-2224:

The original implementation used C++ to implement a handwritten parser, but it 
quickly got complex once we needed to support integers with exponential 
notation. Maybe the complexity of dealing with boost is greater than the 
complexity of debugging a handwritten parser, in which case it would be worth 
it to reimplement it without a regular expression.

> [C++] Replace boost regex usage with libre2
> -------------------------------------------
>                 Key: ARROW-2224
>                 URL: https://issues.apache.org/jira/browse/ARROW-2224
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Phillip Cloud
>            Assignee: Phillip Cloud
>            Priority: Major
> We're using {{boost::regex}} to parse decimal strings for {{decimal128}} 
> types. We should use {{libre2}} instead.

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