> For the complete documentation index, see [llms.txt](https://www.mlcompendium.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.mlcompendium.com/natural-language-processing/string-matching.md).

# String Matching

## Tools

1. [**Fuzzy string matching library - fuzzywuzzy - using edit-distance**](https://towardsdatascience.com/natural-language-processing-for-fuzzy-string-matching-with-python-6632b7824c49)
2. [**Difflib**](https://docs.python.org/3/library/difflib.html)**,** [**difflib**](https://pymotw.com/2/difflib/)**-2**

![Susan Li, Fuzzy Wuzzy String Matching, medium.com](https://lh6.googleusercontent.com/y0wbP76ObQPtAtaM-hXk0uwO1-rtcRXfcB7wEZbbPCE05FexzLYfJZtXRO9GkNGcnAOfyxTuRQDRUszfFL5qz7waIBtYnDiJrceyFl_-8rs82yAZdmcoNVKtDU9EgPgHwT9bTy4z)

## **REGEX**

1. [**Why re is slow** ](https://swtch.com/~rsc/regexp/regexp1.html)
2. [**Benchmark**](https://github.com/mariomka/regex-benchmark)**,** [**comparisons**](https://rust-leipzig.github.io/regex/2017/03/28/comparison-of-regex-engines/)**,** [**more**](https://stackoverflow.com/questions/3544225/regular-expression-library-benchmarks)**,** [**many more**](https://stackoverflow.com/questions/11033190/regex-library-benchmark)**,** 
3. [**Split on separator but keep the separator**](http://programmaticallyspeaking.com/split-on-separator-but-keep-the-separator-in-python.html)**, in Python**
4. [**Semantic versioning**](https://regexr.com/39s32)
5. [**Hyperscan**](https://github.com/intel/hyperscan) **-** [**Hyperscan**](https://www.hyperscan.io/) [**(paper)**](https://www.usenix.org/system/files/nsdi19-wang-xiang.pdf) **is a high-performance multiple regex matching library. It follows the regular expression syntax of the commonly-used libpcre library, but is a standalone library with its own C API.**
6. [**Re2**](https://github.com/google/re2/tree/abseil/python) **-** [**python**](https://pypi.org/project/re2/) **This is the source code repository for RE2, a regular expression library.**

![](https://lh3.googleusercontent.com/-YwR-w4Xp3Z-FJH4yUu23QiFSBgr7EqkKGNhvG-c89kpsaHcEBeiqiUO4nEx-8VzEMIeaJosCR6JhDpWO5hqQjfwL2cSXUXapt_XUa_OdRmClhigiynQzDBy3zdrq_Bj4VYaWv2F)

1. [**Spacy’s Matcher & “regex”**](https://spacy.io/usage/rule-based-matching)
2. [**Flashtext**](https://github.com/vi3k6i5/flashtext)**- This module can be used to replace keywords in sentences or extract keywords from sentences. It is based on the** [**FlashText algorithm**](https://arxiv.org/abs/1711.00046)**.**


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