---

id: expressions

title: Expressions

sidebar_label: Expressions

---


## Overview



*   Tipbox for regexp basics - link to a good guide
*   Expression Editor 
    *   Where to find it


## GREL (General Refine Expression Language)



*   Variables and attributes
*   Syntax and controls
*   String functions
*   Array functions
*   Date functions
*   Project functions
*   Math functions

_Content from_

[https://github.com/OpenRefine/OpenRefine/wiki/General-Refine-Expression-Language](https://github.com/OpenRefine/OpenRefine/wiki/General-Refine-Expression-Language) 

[https://github.com/OpenRefine/OpenRefine/wiki/GREL-Functions](https://github.com/OpenRefine/OpenRefine/wiki/GREL-Functions) 

[https://github.com/OpenRefine/OpenRefine/wiki/GREL-Other-Functions](https://github.com/OpenRefine/OpenRefine/wiki/GREL-Other-Functions) 

etc.


## Jython



*   Python syntax in OpenRefine
*   Installing Python packages


## Clojure



*   Clojure syntax in OpenRefine
*   Using Java packages from Clojure