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Register Highlight is a lightweight Lua plugin for Cheat Engine that highlights user-defined text directly in the Memory Viewer → Disassembler view.

When debugging or reverse engineering, tracking registers across a large block of assembly instructions can become difficult. Important values such as RAX, RCX, or XMM0 can easily get lost in the instruction flow.

Version 1.1 expands the original register-highlighting feature into a more flexible disassembly analysis tool. In addition to registers, the plugin can now highlight register-offset expressions, bracketed memory operands, opcodes, and opcode prefixes.

This makes it easier to follow important values and instructions while scrolling through disassembled code.

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Plugin Information

• Version: 1.1
• Author: FreeER (original) + refactor and optimizations by mul0
• Website: https://mul0.com/cheat-engine/cheat-eng ... highlight/
• Platform: Cheat Engine Lua plugin
• Compatibility: Cheat Engine 6.4 or newer

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What's New in v1.1

• Optimized Highlighting — Refactored and improved the original register-highlighting behavior.
• Register-Offset Expressions — Added support for expressions such as ecx+08 and [ecx+08].
• Whitespace-Insensitive Matching — ecx+08 also matches ecx + 08.
• Offset Normalization — Recognizes equivalent offsets written as 8, 08, 0x08, or 08h.
• Opcode Highlighting — Added support for opcodes such as fld, fstp, and mov.
• Opcode-Prefix Highlighting — Added support for prefixes such as fld dword ptr.
• Syntax Color Preservation — Preserves Cheat Engine syntax colors outside highlighted text.
• Optional Debug Diagnostics — Added troubleshooting output that is disabled by default.

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Plugin Features

• Register Highlighting — Highlights registers such as eax, rax, rcx, xmm0, and r8.
• Expression Highlighting — Highlights memory expressions such as ecx+08 and [ecx+08].
• Opcode Highlighting — Highlights instructions such as fld, fstp, and mov.
• Instruction-Prefix Highlighting — Highlights prefixes such as fld dword ptr.
• x86 and x64 Support — Works with both 32-bit and 64-bit processes.
• Multiple Memory Viewer Windows — Applies highlights per DisassemblerView.
• Safe Hooking — Preserves and restores existing OnPostDisassemble handlers.
• Cheat Engine Syntax Colors — Keeps unrelated disassembly formatting readable.

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How It Works

• Open the Cheat Engine Memory Viewer.

• Select Highlight from the menu.

• Enter the register, expression, opcode, or instruction prefix you want to track.

• The plugin applies a visible color highlight to matching disassembly text while preserving existing Cheat Engine syntax colors outside the matched area.

• Select Highlight again to disable the active highlight.

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🖥 Example Use Cases

• Track a register:
  rax

• Track a memory expression:
  [ecx+08]

• Match expressions with different formatting:
  ecx+08
  ecx + 08
  ecx+0x08
  ecx+08h

• Track an opcode:
  fld

• Track an instruction prefix:
  fld dword ptr

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Compatibility

• Cheat Engine 6.4 or newer
• Supports x86 and x64 processes
• Works with multiple Memory Viewer instances
• Preserves existing Cheat Engine disassembler syntax highlighting
• Compatible with other plugins that use OnPostDisassemble handlers

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Installation

• Download "MiMemory Viewer - Highlight (v1.1).lua".
• Place the file inside the Cheat Engine autorun folder:
  Cheat Engine\autorun\
• Start or restart Cheat Engine.
• Open Memory Viewer.
• Select Highlight from the menu and enter the text you want to track.

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Important Notes

• Highlighting is applied per DisassemblerView.
• Register-offset matching supports bracketed and non-bracketed expressions.
• Equivalent offset formats such as 8, 08, 0x08, and 08h are recognized.
• Existing Cheat Engine syntax colors outside highlighted text are preserved.
• Optional debug diagnostics are disabled by default.

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Feedback & Support

• Have suggestions, bug reports, or ideas for improvement? Leave a comment on the blog — feedback is always welcome!