great 
may you explain why
[:parse ("global "vlan_common";:global testx ($"$([
is necessary?
"global "vlan_common"
→ (evl /globalname=$vlan_common)
what happens next?
in particular ($"$
as I would expect that
:put ( ( :parse ("$"vlan_common" ") ) )
gives the content of global “vlan_common”
All this is just for example, just to make your idea work, but is better do more “polite” code…
for example this is really hard to read and understand…
[:parse ("global \"vlan_common\";:global testx (\$\"$([:toarray "UP,vlan_common,KIDS"]->1)\"->\"name\")")]
something like this is better (example not tested):
:global readfromthis ([:toarray "UP,vlan_common,KIDS"]->1)
:global readthisfield "name"
[:parse ("global \"vlan_common\";:global testx (\$\"$readfromthis\"->\"$readthisfield\")")]
great
may you explain why
[:parse ("global "vlan_common";:global testx ($"$([
is necessary?
Because you must declare the variable used or do not work
"global "vlan_common"
→ (evl /globalname=$vlan_common)
what happens next?
I do not go inside how internally the script are converted and run, if you obtain “evl” as results, probably you use “:parse” on wrong way
“:parse” must be executed, not readed or assigned…
in particular ($"$
as I would expect that
:put ( ( :parse ("$"vlan_common" ") ) )
gives the content of global “vlan_common”
again, “:put” can not read “:parse” as expected from you…
but
[admin@MikroTik] <SAFE> :put ( :parse ("$(vlancommon)") )
comment=COMMON SERVICES AND DEVICES / OFFICE;id=100;name=VLAN_COMMON
works
declaration is done in line one, so why doing it again?
because every time you “:parse”, is like you start another program,
what is do with previous “:parse” is lost
with “:global variablename” you instruct the system than you want use (already created or not) the variable “variablename”
when you write ":put (:parse ...)" on that way, simply the script convert vlancommon value (array) to "instructions" and the result is "comment...." (because internally the arrays are sort)
please do not give "but", only questions.
will do
I was able to proceed thx to your comments, some questions are remaining.
I will add code later or tomorrow (hopefully) with the full code
I do not want be unpolite “but” for me is hard to explain, I’m not english
travelling was more time-consuming than expected but here we go, my configuration/script
I modified your code slightly:
# name the device being configured
/system identity set name="AP+ES_GF_MT-hAP-ac3"
# create one bridge, with defaults only
/interface bridge
add name=bridge-VLANs
# add VLANs
/interface vlan
add interface=bridge-VLANs vlan-id=999 name=VLAN_MGMT comment="NETWORK DEVICES MANAGEMENT VLAN"
# VLAN interface for L3 Management Access
/ip address
add address=10.10.9.001/24 interface=VLAN_MGMT comment="NETWORK DEVICES MANAGEMENT VLAN" --> CR_2B_MT-CCR1009-8G-1S-1S+
add address=10.10.9.002/24 interface=VLAN_MGMT comment="NETWORK DEVICES MANAGEMENT VLAN" --> CS-PoE_2B_MT-CRS328-24P-4S+
# The route to the router to allow L3 communication.
/ip route
add gateway=10.10.9.1 distance=1
# DNS server, to allow ROS to resolve DNS queries from the CPUto fetch updates etc.
/ip dns
set allow-remote-requests=no servers="10.10.9.1"
#ES_GF-E_MT-hEX-S
/interface ethernet
set comment="TP, VLAN-TRUNK TO CORE-SWITCH-SFP" [find name=sfp1]
set comment="UP, don't touch (temporarily)" [find name=ether1]
set comment="UP, VLAN_USER1, OFFICE, UNMANAGED SWITCH" [find name=ether2]
set comment="UP, VLAN_USER2, KIDS" [find name=ether3]
set comment="UP, VLAN_USER2, LIVING ROOM" [find name=ether4]
set comment="UP, don't touch (temporarily)" [find name=ether5]
## START OF SCRIPT
#creating variable per VLAN and other variables
:global "VLAN_BKHOLE" { vlanid=001; name="VLAN_BKHOLE" ; comment="BLACKHOLE" }
:global "VLAN_SYS" { vlanid=008; name="VLAN_SYS" ; comment="SYS" }
:global "VLAN_GUEST" { vlanid=011; name="VLAN_GUEST" ; comment="GUEST" }
:global "VLAN_USER1" { vlanid=110; name="VLAN_USER1" ; comment="USER 1,all devices in one vlan" }
:global "VLAN_USER2" { vlanid=120; name="VLAN_USER2" ; comment="USER 2,all devices in one vlan" }
:global filterUP "^UP, VLAN_USER"
:global BridgeName "bridge-VLANs"
:global result
#show configuration before script execution
interface ethernet print where comment~"^UP."
interface bridge port print
#clear anything in /interface bridge port if there is an existing configuration
:put "CLEAR EXISTING BRIDGE PORT CONFIGURATION
:foreach Interface in=[ /interface bridge port find ] do={ /
/interface bridge port remove $Interface
}
#show that /interface bridge port is empty
/interface bridge port print
#add Bridge Ports according to the comment of the interfaces. PVID is set as well.
:put "STARTING SCRIPT-BASED BRIDGE PORT CREATION
:foreach Interface in=[ /interface ethernet find where comment~$filterUP ] do={ /
:local readcomment ( [ :toarray ([/interface ethernet get $Interface]->"comment" ) ]->1 )
:local readthisfield "vlanid"
[:parse ("global \"$readcomment\";:global result (\$\"$readcomment\"->\"$readthisfield\")")]
/interface bridge port add interface=$Interface bridge=$BridgeName pvid=$result
}
"show result
:put "SHOW RESULTS"
/interface ethernet print where comment~"^UP,"
/interface bridge port print
/interface bridge port print where pvid=110
/interface bridge port print where pvid=120
and the reduced code generated OUTPUT:
/interface ethernet print where comment~"^UP,"
Flags: R - RUNNING; S - SLAVE
Columns: NAME, MTU, MAC-ADDRESS, ARP, SWITCH
# NAME MTU MAC-ADDRESS ARP SWITCH
;;; UP, don't touch (temporarily)
0 R ether1 1500 08:55:31:0F:52:97 enabled switch1
;;; UP, VLAN_USER1, OFFICE, UNMANAGED SWITCH
1 S ether2 1500 08:55:31:0F:52:98 enabled switch1
;;; UP, VLAN_USER2, KIDS
2 S ether3 1500 08:55:31:0F:52:99 enabled switch1
;;; UP, VLAN_USER2, LIVING ROOM
3 S ether4 1500 08:55:31:0F:52:9A enabled switch1
;;; UP, don't touch (temporarily)
4 ether5 1500 08:55:31:0F:52:9B enabled switch1
CLEAR EXISTING BRIDGE PORT CONFIGURATION
STARTING SCRIPT-BASED BRIDGE PORT CREATION
SHOW RESULTS
/interface ethernet print where comment~"^UP,"
Flags: I - INACTIVE; H - HW-OFFLOAD
Columns: INTERFACE, BRIDGE, HW, PVID, PRIORITY, PATH-COST, INTERNAL-PATH-COST, HORIZON
# INTERFACE BRIDGE HW PVID PRIORITY PATH-COST INTERNAL-PATH-COST HORIZON
0 IH ether2 bridge-VLANs yes 110 0x80 10 10 none
1 IH ether3 bridge-VLANs yes 120 0x80 10 10 none
2 IH ether4 bridge-VLANs yes 120 0x80 10 10 none
[admin@MikroTik] /interface/mesh> /interface bridge port print where pvid=110
Flags: I - INACTIVE; H - HW-OFFLOAD
Columns: INTERFACE, BRIDGE, HW, PVID, PRIORITY, PATH-COST, INTERNAL-PATH-COST, HORIZON
# INTERFACE BRIDGE HW PVID PRIORITY PATH-COST INTERNAL-PATH-COST HORIZON
0 IH ether2 bridge-VLANs yes 110 0x80 10 10 none
[admin@MikroTik] /interface/mesh> /interface bridge port print where pvid=120
Flags: I - INACTIVE; H - HW-OFFLOAD
Columns: INTERFACE, BRIDGE, HW, PVID, PRIORITY, PATH-COST, INTERNAL-PATH-COST, HORIZON
# INTERFACE BRIDGE HW PVID PRIORITY PATH-COST INTERNAL-PATH-COST HORIZON
1 IH ether3 bridge-VLANs yes 120 0x80 10 10 none
2 IH ether4 bridge-VLANs yes 120 0x80 10 10 none
but no clue why
:global result
and
:local readcomment ( [ :toarray ([/interface ethernet get $Interface]->"comment" ) ]->1 )
:local readthisfield "vlanid"
are working
but making
:global result
local
:local readcomment ( [ :toarray ([/interface ethernet get $Interface]->"comment" ) ]->1 )
:local readthisfield "vlanid"
:local result
fails
Moreover, if first global
[:parse ("global \"$readcomment\";:global result (\$\"$readcomment\"->\"$readthisfield\")")]
is changed to local
[:parse ("lcoal \"$readcomment\";:global result (\$\"$readcomment\"->\"$readthisfield\")")]
I get
invalid value for pvid, an integer required
means the comment was not read
Your question is like <<why if I change “3 + 3” to “3 x 3” I have different results?>>
If the variable is not global (or saved inside a file or mikrotik configuration), is not possible to see it inside another running script, as already I say, “:parse” is a separate execution of the script…
And as already wrotten, you must use “:global variable” to inform the separate script than you want to use that global variable.
Local variable exist only inside the “for” cycle, and when you call “:parse”, declared or not, is unable to see the variable because is not global.
I understand you want know how the scripts works, but if I say (and demostrate) than 3+3 do 6,
do not ask question aboput because 3x3 do 9… keep the things on how are working…
I think I almost have it, see below.
If anyone could answer the remaining question it would be just great 
[ :parse (" global "$readcomment"; :global result ( $"$readcomment" -> "$readthisfield" ) ") ]
[admin@MikroTik] > :global "vlan_common" {id=100;name="VLAN_COMMON";comment="COMMON SERVICES AND DEVICES / OFFICE"}
[admin@MikroTik] > :put ($"vlan_common")
comment=COMMON SERVICES AND DEVICES / OFFICE;id=100;name=VLAN_COMMON
[admin@MikroTik] > put [:parse ("global \"vlan_common\" ") ]
(evl /globalname=$vlan_common)
[rex@net] > :put [:parse ":put 777"]
(eval /putmessage=777)
[rex@net] > [:parse ":put 777"]
777
3), 5) and 6) understanding 2) and what are a global variable, the 3), 5 and 6) are useless
where is the question?
Not, this indicate → what element you want read or write based on what the script do.
For example on array {id=100;name=“VLAN_COMMON”;comment=“COMMON SERVICES AND DEVICES / OFFICE”}
Read:
:put ($array->“name”)
VLAN_COMMON
Write:
:set ($array->“name”) “newname”
the array change to {id=100;name=“newname”;comment=“COMMON SERVICES AND DEVICES / OFFICE”}
Try This
:local id 1;
:local nwshost Tes1,Tes2,Tes3,Tes4,Tes5,Tes6,Tes7,Tes8,Tes9
:foreach nwsarr in=$nwshost do={
:local date [/system clock get date]
:local time [/system clock get time]
[:parse ":global Down$nwsarr"];
[:parse ":global check$nwsarr"];
[
:execute (" \
:if (\$\"check$nwsarr\" != 1) do={ :set check$nwsarr \"2\"; }; \; \
:set Down$nwsarr \"$date $time\"; \
")
];
:set id ($id+1)
}
Just necroposting. Nothing usable and full of frills and errors. For example: :if (check$nwsarr must be :if ($check$nwsarr
/system clock
:local datetime “$[get date] $[get time]”
:local nwshost (“Tes1”,“Tes2”,“Tes3”,“Tes4”,“Tes5”,“Tes6”,“Tes7”,“Tes8”,“Tes9”)
:local id (1 + [:len $nwshost])
:foreach item in=$nwshost do={
[:parse “:global check$item ; :if ($check$item != 1) do={:set check$item 2}”]
[:parse “:global Down$item "$datetime"”]
}
If in execute
:if ($"check$nwsarr" != 1) do={ :set check$nwsarr "2"; }; \
While it’s nifty trick to use [:parse] to create new globals or use one without a declaration… In most cases, your better off using an array-of-maps or array-of-lists & using TWO :foreach loops.
And bad examples of using [:parse] to have “dynamic variable names” are even less helpful.
You edit your post, but is still full of frills and errors.
If you try to correct someone who corrects you, at least make sure you correct well...
If 2 is a number there is no need for "", if instead it is a string, then consistently the 1 must also be quoted...
And about "check$nwsarr" must be, for the same reason, :set "check$nwsarr" and :set "Down$nwsarr"
I do not have added " (on all places) for not add unreadability on code.
Since someone is not so dumb to use problematic variable names... Or not?
Rightly so, what @Amm0 says is correct.
Without parse, execute and other frills...
{
:global gev
:if ([:typeof [$gev]] = "nil") do={:global gev [:toarray ""]}
/system clock
:local datetime "$[get date] $[get time]"
:local nwshost ("Tes1","Tes2","Tes3","Tes4","Tes5","Tes6","Tes7","Tes8","Tes9")
:local id (1 + [:len $nwshost])
:set ($gev->"checkTes2") 1 ; # for test if work (($gev->"checkTes2") != 1)
:foreach item in=$nwshost do={
:if (($gev->"check$item") != 1) do={:set ($gev->"check$item") 2}
:set ($gev->"Down$item") $datetime
}
:put ($gev->"checkTes2")
:put ($gev->"DownTes2")
:put ($gev->"checkTes4")
:put ($gev->"DownTes4")
}