Simplify REGEX

[CarbonCriterium]

Several months back I created a macro with the following regular expressions to "clean up" and concatenate several strings that I  often use.  Is there a website or tool that would help me to understand regex so that I may figure out how to simplify the search string? 

My goal is to speed up the search.  I think eliminating the redundant rex commands would help but if there is an even better solution I want to know what it is.

The macro currently contains the following:

| eval source_clean=source 
| rex field=source_clean mode=sed "s/\\\u_\S+//g" 
| rex field=source_clean mode=sed "s/^[^\\\]*\\\//" 
| rex field=source_clean mode=sed "s/^[^\\\]*\\\//" 
| rex field=source_clean mode=sed "s/^[^\\\]*\\\//" 
| lookup Source-Lookup.csv source AS source_clean OUTPUT web_domain 
| eval pages = web_domain+cs_uri_stem​​​​​​​

 
I do not have access to the lookup table that would allow me to add slashes to the `source column` as a way to eliminate the need for lines 3-5.  

[gcusello · Accepted solution]

Hi @CarbonCriterium,

regex101.com is very useful to understand a regex, but to simplify your regex you have to work by yourself or sharing samples.

Ciao.

Giuseppe