# Ignition Perspective Tag Value Change script help **URL:** \ **Category:** Ignition\ **Tags:** ignition81, perspective\ **Created:** [April 16, 2024, 5:53pm UTC](https://forum.inductiveautomation.com/t/ignition-perspective-tag-value-change-script-help/88922 "2024-04-16T17:53:42Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![Ryan\_Craig](https://avatars.discourse-cdn.com/v4/letter/r/45deac/32.png) [@Ryan\_Craig](https://forum.inductiveautomation.com/u/Ryan_Craig)\ **Post date:** [April 16, 2024, 5:53pm UTC](https://forum.inductiveautomation.com/t/ignition-perspective-tag-value-change-script-help/88922/1 "2024-04-16T17:53:42Z")
I am trying to use a script that will pick out parts of a string entered and send those parts to another tag. I was able to get this script working on our Dev server: ```auto def valueChanged(tag, tagPath, previousValue, currentValue, initialChange, missedEvents): if currentValue.value != '': data = str(currentValue) import re m = re.search('.*PN: (.+)BN:\\s*([0-9]{7}).*', data) ###system.tag.writeBlocking("[.]JobScan",m.group(0)) system.tag.writeBlocking("[.]PartNumber",m.group(1)) system.tag.writeBlocking("[.]BatchNumber",m.group(2)) else: system.tag.writeBlocking("[.]PartNumber",'') system.tag.writeBlocking("[.]BatchNumber",'') ``` but then I transferred it to our production server and it doesn't seem to work now. I tried to switch the tag paths to point to the new tag paths and it still doesn't work: ```auto def valueChanged(tag, tagPath, previousValue, currentValue, if currentValue.value != '': data = str(currentValue.value) import re m = re.search('.*PN: (.+)BN:\\s*([0-9]{7}).*', data) ###system.tag.writeBlocking("[.]JobScan",m.group(0)) system.tag.writeBlocking(["[default]E398/E398/JobScanInfo/PartNumber.value"],[m.group(1)]) system.tag.writeBlocking(["[default]E398/E398/JobScanInfo/BatchNumber.value"],[m.group(2)]) else: system.tag.writeBlocking(["[default]E398/E398/JobScanInfo/PartNumber.value"],['']) system.tag.writeBlocking(["[default]E398/E398/JobScanInfo/BatchNumber.value"],['']) ``` Am I missing something? EDIT: I tried to copy a working value change script from another tag to this one, and it doesn't work. It works perfectly fine for the tag I copied it from, but when I past it into this tags value changed script, it won't write to the other tag. Here is the script that works for one tag but not the other: ```auto if currentValue.value != '': system.tag.writeBlocking('[default]{ENumber}/{ENumber}/JobScanInfo/PartNumberMem.value', currentValue.value) ``` ---
**Author:** ![Ryan\_Craig](https://avatars.discourse-cdn.com/v4/letter/r/45deac/32.png) [@Ryan\_Craig](https://forum.inductiveautomation.com/u/Ryan_Craig)\ **Post date:** [April 16, 2024, 6:46pm UTC](https://forum.inductiveautomation.com/t/ignition-perspective-tag-value-change-script-help/88922/2 "2024-04-16T18:46:38Z")
I have found that it is the ```auto m = re.search('.*PN: (.+)BN:\\s*([0-9]{7}).*', data) ``` part of the script. Any idea why it would work for our dev gateway and not our production gateway? ---
**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\ **Post date:** [April 16, 2024, 6:58pm UTC](https://forum.inductiveautomation.com/t/ignition-perspective-tag-value-change-script-help/88922/3 "2024-04-16T18:58:36Z")
Your strings aren't what they're supposed to be, so the regex is failing? Try `print repr(system.tag.readBlocking(["whateverTagThisIs"])[0].value)` In the script console on the production system. ---
**Author:** ![Ryan\_Craig](https://avatars.discourse-cdn.com/v4/letter/r/45deac/32.png) [@Ryan\_Craig](https://forum.inductiveautomation.com/u/Ryan_Craig)\ **Post date:** [April 16, 2024, 7:12pm UTC](https://forum.inductiveautomation.com/t/ignition-perspective-tag-value-change-script-help/88922/5 "2024-04-16T19:12:54Z")
I did this and it is printing out the correct value of the tag, except it has a 'u' infront of it for some reason... ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/9/9/994ec504d0e60dc1a47eec08f0e98f1319246e39.png) But this is the same output as the project on our Dev server that is working correctly ---
**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\ **Post date:** [April 16, 2024, 7:14pm UTC](https://forum.inductiveautomation.com/t/ignition-perspective-tag-value-change-script-help/88922/6 "2024-04-16T19:14:33Z")
Is it the escaped `\\s` after BN? > **[regex101: build, test, and debug regex](https://regex101.com/r/Z61asj/1)** > > Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/.NET, Rust. ---
**Author:** ![Ryan\_Craig](https://avatars.discourse-cdn.com/v4/letter/r/45deac/32.png) [@Ryan\_Craig](https://forum.inductiveautomation.com/u/Ryan_Craig)\ **Post date:** [April 16, 2024, 7:21pm UTC](https://forum.inductiveautomation.com/t/ignition-perspective-tag-value-change-script-help/88922/7 "2024-04-16T19:21:57Z")
I don't think so. I messed around with that on my project that is working and it is giving me the correct output every time. When I try it on my other gateway, it won't write anything as soon as I put the ```auto m = re.search('.*PN: (.+)BN:\\s*([0-9]{7}).*', data) ``` line of code. I was using this code ```auto def valueChanged(tag, tagPath, previousValue, currentValue, initialChange, missedEvents): if currentValue.value != '': import re m = re.search('.*PN: (.+)BN:\s*([0-9]{7}).*', data) system.tag.writeBlocking('[default]{ENumber}/{ENumber}/JobScanInfo/PartNumberMem.value', currentValue.value) ``` starting with just the writeBlocking, then started adding more line by line until it wouldn't print anymore. Even if I comment out the line, it still stops it from writing until I completely delete it. ---
**Author:** ![Transistor](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/transistor/32/3380_2.png) [@Transistor](https://forum.inductiveautomation.com/u/Transistor)\ **Post date:** [April 16, 2024, 7:23pm UTC](https://forum.inductiveautomation.com/t/ignition-perspective-tag-value-change-script-help/88922/8 "2024-04-16T19:23:47Z")
> [@Ryan\_Craig](#): > > except it has a 'u' infront of it for some reason... That just means it's a Unicode string (supporting a wider character set). You shouldn't have to worry about it. ---
**Author:** ![Ryan\_Craig](https://avatars.discourse-cdn.com/v4/letter/r/45deac/32.png) [@Ryan\_Craig](https://forum.inductiveautomation.com/u/Ryan_Craig)\ **Post date:** [April 16, 2024, 7:43pm UTC](https://forum.inductiveautomation.com/t/ignition-perspective-tag-value-change-script-help/88922/9 "2024-04-16T19:43:08Z")
I have found out that the issue is the {} around the 7, but I am not sure of a work around ---
**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\ **Post date:** [April 16, 2024, 8:01pm UTC](https://forum.inductiveautomation.com/t/ignition-perspective-tag-value-change-script-help/88922/10 "2024-04-16T20:01:56Z")
Oh, wait, are you writing this script out in a UDT? I think you're getting hit by a bug with parameter referencing; it's attempting to replace the curly brace portion as if it were a UDT parameter. Try putting your code in the project library (in your gateway scripting project) and calling it from your tag.