apache - Use variables to simplify mod_rewrite rules in .htaccess file -


i have inherited .htaccess file extremely complex set of mod_rewrite rules, there 100 lines lot of duplication this:

rewritecond %{request_uri} !^/(test|dev|((current|archive|all|2x|19|20|21|22|23|24|25|26|27)/([a-z]{2}|pt_br)))/favicon.ico rewritecond %{request_uri} !^/(test|dev|((current|archive|all|2x|19|20|21|22|23|24|25|26|27)/([a-z]{2}|pt_br)))/robots.txt rewriterule ^(test|dev|((current|archive|all|2x|19|20|21|22|23|24|25|26|27)/([a-z]{2}|pt_br)))/(.*) /index.php?title=$5 [l,qsa,s=1]

(note rules have slight differences , aren't same, there constituent parts consistent between them.)

i use variables make these rules more maintainable, possible? long lines of pseudo-example: 

# define variables versions=(current|archive|all|2x|19|20|21|22|23|24|25|26|27) languages=(current|archive|all|2x|19|20|21|22|23|24|25|26|27) # body of rules rewritecond %{request_uri} !^/(test|dev|($versions/$languages))/favicon.ico rewritecond %{request_uri} !^/(test|dev|($versions/$languages))/robots.txt rewriterule ^(test|dev|($versions/$languages)/(.*) /index.php?title=$5 [l,qsa,s=1]

well cannot store partial regex in variables this.

as workaround can set env variables if these conditions true:

rewriterule (current|archive|all|2x|19|20|21|22|23|24|25|26|27) - [e=version:$1]  rewriterule (current|archive|all|2x|19|20|21|22|23|24|25|26|27) - [e=lang:$1]

once done can use these environment variables in rules in conditions:

rewritecond %{env:version} .+

or

rewritecond %{env:lang} .+

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