I finally got around to test this but it seems I'm doing something wrong:
```
#!substdef "/DBRWUSER/$env(DBRWUSER)/g"
#!substdef "/DBRWPW/$env(DBRWPW)/g"
#!substdef "/DBHOST/$env(DBHOST)/g"
#!substdef "/DBNAME/$env(DBNAME)/g"
#!define DBURL "mysql://DBRWUSER:DBRWPW@DBHOST/DBNAME"
```
Now trying to start Kamailio (5.3.3 as suggested) fails:
```
kamailio_1 | 0(1) ERROR: <core> [core/pvapi.c:923]: pv_parse_spec2(): error
searching pvar "env"
kamailio_1 | 0(1) ERROR: <core> [core/pvapi.c:1126]: pv_parse_spec2(): wrong
char [D/68] in [$env(DBRWUSER)/g] at [5 (5)]
kamailio_1 | 0(1) ERROR: <core> [core/re.c:170]: parse_repl(): bad specifier
in replace part /$env(DBRWUSER)/g
kamailio_1 | 0(1) ERROR: <core> [core/ppcfg.c:69]: pp_subst_add(): bad subst
expression: /DBRWUSER/$env(DBRWUSER)/g
kamailio_1 | 0(1) ERROR: <core> [core/ppcfg.c:96]: pp_substdef_add(): subst
rule cannot be added
```
I also tried the following but it doesn't make a difference:
```
#!substdef
"!DBURL!mysql://$env(DBRWUSER):$env(DBRWPW)@$env(DBHOST)/$env(DBNAME)!"
```
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