command /test:
    trigger:
        send regex split "test" at "\b{_name}\b"

[18:24:20 ERROR]: #!#!
[18:24:20 ERROR]: #!#! [Skript] Severe Error:
[18:24:20 ERROR]: #!#!
[18:24:20 ERROR]: #!#! Something went horribly wrong with Skript.
[18:24:20 ERROR]: #!#! This issue is NOT your fault! You probably can't fix it yourself, either.
[18:24:20 ERROR]: #!#! It looks like you are using some plugin(s) that alter how Skript works (addons).
[18:24:20 ERROR]: #!#! Here is full list of them:
[18:24:20 ERROR]: #!#! skript-reflect v2.5.1 (https://github.com/SkriptLang/skript-reflect)
[18:24:20 ERROR]: #!#! We could not identify which of those are specially related, so this might also be Skript issue.
[18:24:20 ERROR]: #!#! You should try disabling those plugins one by one, trying to find which one causes it.
[18:24:20 ERROR]: #!#! If the error doesn't disappear even after disabling all listed plugins, it is probably Skript issue.
[18:24:20 ERROR]: #!#! In that case, you will be given instruction on how should you report it.
[18:24:20 ERROR]: #!#! On the other hand, if the error disappears when disabling some plugin, report it to author of that plugin.
[18:24:20 ERROR]: #!#! Only if the author tells you to do so, report it to Skript's issue tracker.
[18:24:20 ERROR]: #!#!
[18:24:20 ERROR]: #!#! Stack trace:
[18:24:20 ERROR]: #!#! java.util.regex.PatternSyntaxException: Illegal repetition near index 3
\b{_name}\b
   ^
[18:24:20 ERROR]: #!#!     at java.base/java.util.regex.Pattern.error(Pattern.java:2204)
[18:24:20 ERROR]: #!#!     at java.base/java.util.regex.Pattern.closure(Pattern.java:3488)
[18:24:20 ERROR]: #!#!     at java.base/java.util.regex.Pattern.sequence(Pattern.java:2390)
[18:24:20 ERROR]: #!#!     at java.base/java.util.regex.Pattern.expr(Pattern.java:2245)
[18:24:20 ERROR]: #!#!     at java.base/java.util.regex.Pattern.compile(Pattern.java:1945)
[18:24:20 ERROR]: #!#!     at java.base/java.util.regex.Pattern.<init>(Pattern.java:1576)
[18:24:20 ERROR]: #!#!     at java.base/java.util.regex.Pattern.compile(Pattern.java:1101)
[18:24:20 ERROR]: #!#!     at java.base/java.lang.String.split(String.java:3356)
[18:24:20 ERROR]: #!#!     at java.base/java.lang.String.split(String.java:3229)
[18:24:20 ERROR]: #!#!     at Skript-2.9.3.jar//ch.njol.skript.expressions.ExprJoinSplit.get(ExprJoinSplit.java:84)
[18:24:20 ERROR]: #!#!     at Skript-2.9.3.jar//ch.njol.skript.expressions.ExprJoinSplit.get(ExprJoinSplit.java:27)
[18:24:20 ERROR]: #!#!     at Skript-2.9.3.jar//ch.njol.skript.lang.util.SimpleExpression.getArray(SimpleExpression.java:97)
[18:24:20 ERROR]: #!#!     at Skript-2.9.3.jar//ch.njol.skript.expressions.ExprJoinSplit.get(ExprJoinSplit.java:71)
[18:24:20 ERROR]: #!#!     at Skript-2.9.3.jar//ch.njol.skript.expressions.ExprJoinSplit.get(ExprJoinSplit.java:27)
[18:24:20 ERROR]: #!#!     at Skript-2.9.3.jar//ch.njol.skript.lang.util.SimpleExpression.getArray(SimpleExpression.java:97)
[18:24:20 ERROR]: #!#!     at Skript-2.9.3.jar//ch.njol.skript.effects.EffChange.execute(EffChange.java:284)
[18:24:20 ERROR]: #!#!     at Skript-2.9.3.jar//ch.njol.skript.lang.Effect.run(Effect.java:49)
[18:24:20 ERROR]: #!#!     at Skript-2.9.3.jar//ch.njol.skript.lang.TriggerItem.walk(TriggerItem.java:58)
[18:24:20 ERROR]: #!#!     at Skript-2.9.3.jar//ch.njol.skript.lang.TriggerItem.walk(TriggerItem.java:85)
[18:24:20 ERROR]: #!#!     at Skript-2.9.3.jar//ch.njol.skript.lang.Trigger.execute(Trigger.java:51)
[18:24:20 ERROR]: #!#!     at Skript-2.9.3.jar//ch.njol.skript.command.ScriptCommand.execute2(ScriptCommand.java:345)
[18:24:20 ERROR]: #!#!     at Skript-2.9.3.jar//ch.njol.skript.command.ScriptCommand.lambda$execute$0(ScriptCommand.java:304)
[18:24:20 ERROR]: #!#!     at Skript-2.9.3.jar//ch.njol.skript.command.ScriptCommand.execute(ScriptCommand.java:315)
[18:24:20 ERROR]: #!#!     at Skript-2.9.3.jar//ch.njol.skript.command.ScriptCommand.onCommand(ScriptCommand.java:250)
[18:24:20 ERROR]: #!#!     at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45)
[18:24:20 ERROR]: #!#!     at io.papermc.paper.command.brigadier.bukkit.BukkitCommandNode$BukkitBrigCommand.run(BukkitCommandNode.java:91)
[18:24:20 ERROR]: #!#!     at com.mojang.brigadier.context.ContextChain.runExecutable(ContextChain.java:73)
[18:24:20 ERROR]: #!#!     at net.minecraft.commands.execution.tasks.ExecuteCommand.execute(ExecuteCommand.java:31)
[18:24:20 ERROR]: #!#!     at net.minecraft.commands.execution.tasks.ExecuteCommand.execute(ExecuteCommand.java:19)
[18:24:20 ERROR]: #!#!     at net.minecraft.commands.execution.UnboundEntryAction.lambda$bind$0(UnboundEntryAction.java:8)
[18:24:20 ERROR]: #!#!     at net.minecraft.commands.execution.CommandQueueEntry.execute(CommandQueueEntry.java:5)
[18:24:20 ERROR]: #!#!     at net.minecraft.commands.execution.ExecutionContext.runCommandQueue(ExecutionContext.java:103)
[18:24:20 ERROR]: #!#!     at net.minecraft.commands.Commands.executeCommandInContext(Commands.java:443)
[18:24:20 ERROR]: #!#!     at net.minecraft.commands.Commands.performCommand(Commands.java:350)
[18:24:20 ERROR]: #!#!     at net.minecraft.commands.Commands.performCommand(Commands.java:337)
[18:24:20 ERROR]: #!#!     at net.minecraft.commands.Commands.performCommand(Commands.java:332)
[18:24:20 ERROR]: #!#!     at net.minecraft.server.network.ServerGamePacketListenerImpl.performUnsignedChatCommand(ServerGamePacketListenerImpl.java:2147)
[18:24:20 ERROR]: #!#!     at net.minecraft.server.network.ServerGamePacketListenerImpl.lambda$handleChatCommand$11(ServerGamePacketListenerImpl.java:2121)
[18:24:20 ERROR]: #!#!     at net.minecraft.server.TickTask.run(TickTask.java:18)
[18:24:20 ERROR]: #!#!     at net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:151)
[18:24:20 ERROR]: #!#!     at net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:24)
[18:24:20 ERROR]: #!#!     at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:1537)
[18:24:20 ERROR]: #!#!     at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:201)
[18:24:20 ERROR]: #!#!     at net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:125)
[18:24:20 ERROR]: #!#!     at net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServer.java:1514)
[18:24:20 ERROR]: #!#!     at net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:1507)
[18:24:20 ERROR]: #!#!     at net.minecraft.util.thread.BlockableEventLoop.managedBlock(BlockableEventLoop.java:135)
[18:24:20 ERROR]: #!#!     at net.minecraft.server.MinecraftServer.managedBlock(MinecraftServer.java:1466)
[18:24:20 ERROR]: #!#!     at net.minecraft.server.MinecraftServer.waitUntilNextTick(MinecraftServer.java:1473)
[18:24:20 ERROR]: #!#!     at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1318)
[18:24:20 ERROR]: #!#!     at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:330)
[18:24:20 ERROR]: #!#!     at java.base/java.lang.Thread.run(Thread.java:1583)
[18:24:20 ERROR]: #!#!
[18:24:20 ERROR]: #!#! Version Information:
[18:24:20 ERROR]: #!#!   Skript: 2.9.3 (custom version)
[18:24:20 ERROR]: #!#!     Flavor: selfbuilt-unknown
[18:24:20 ERROR]: #!#!     Date: unknown
[18:24:20 ERROR]: #!#!   Bukkit: 1.21-R0.1-SNAPSHOT
[18:24:20 ERROR]: #!#!   Minecraft: 1.21
[18:24:20 ERROR]: #!#!   Java: 21.0.3 (Java HotSpot(TM) 64-Bit Server VM 21.0.3+7-LTS-152)
[18:24:20 ERROR]: #!#!   OS: Windows 10 amd64 10.0
[18:24:20 ERROR]: #!#!
[18:24:20 ERROR]: #!#! Server platform: Paper
[18:24:20 ERROR]: #!#!
[18:24:20 ERROR]: #!#! Current node: null
[18:24:20 ERROR]: #!#! Current item: set {_request} (as java.lang.Object) to join regex split {_request} (as java.lang.String) at "\b{_name}\b" with {_coloured-name} (as java.lang.String)
[18:24:20 ERROR]: #!#! Current trigger: command /action (simple event) (chertia\chat\actions.sk, line 17)
[18:24:20 ERROR]: #!#!
[18:24:20 ERROR]: #!#! Thread: Server thread
[18:24:20 ERROR]: #!#!
[18:24:20 ERROR]: #!#! Language: english
[18:24:20 ERROR]: #!#! Link parse mode: DISABLED
[18:24:20 ERROR]: #!#!
[18:24:20 ERROR]: #!#! End of Error.
[18:24:20 ERROR]: #!#!