Function Syntax: ReplaceBlockList Version: 1.0 Date: 20.06.2026 6:38:49PM WEB Function Syntax: ReplaceBlockList Command: ReplaceBlockList SEO Friendly AutoCAD Block Replacement Utility 🔁 ReplaceBlockList is an AutoCAD LISP tool for batch block replacement using a visual DCL rule list, dual multi-select block panels, wildcard filters, preview counts, and optional property preservation. 🚀 Run ReplaceBlockList to open the replacement manager and build multiple source-to-replacement block rules in one workflow. Main Purpose 🧱 This utility helps CAD users replace many block references across the active drawing without manually copying, aligning, scaling, rotating, and deleting blocks one by one. 📋 The dialog creates clear SourceBlock -> ReplacementBlock rules and applies them drawing-wide after previewing the number of affected source instances. SEO Optimized Description 🔁 ReplaceBlockList is useful for AutoCAD block replacement, CAD standards cleanup, drawing modernization, symbol swapping, repeated detail updates, block library migration, and production drawing correction. 🔍 The routine scans normal block definitions, filters out xrefs, layout blocks, and anonymous names, then displays the usable block names in an organized DCL interface. 🧠 Users can create multiple replacement rules at once by selecting matching block names from the replacement list and the source list. Functionalities 🚀 Dedicated command - starts the full replacement interface with ReplaceBlockList. 🧱 Block table scan - lists non-xref, non-layout, non-anonymous block definitions from the active drawing. 📌 Dual multi-select panels - uses replacement blocks on the left and source blocks to replace on the right. 🔍 Wildcard filters - supports search patterns such as * and ?. ☑️ Selection controls - includes Select All, Select None, Apply Filter, Clear Filter, and Refresh List buttons. 📋 Rule-based replacement - builds visible Source -> Replacement rules before editing the drawing. 👁️ Preview before apply - shows each rule with source instance counts before the replacement is executed. 📐 Keep insertion point - can preserve the original source block placement. 🧭 Keep rotation - can preserve the source block rotation angle. 📏 Keep scale - can preserve effective X, Y, and Z scale factors. 💾 Saved settings - remembers filters, rules, and keep-property toggles in ReplaceBlockList.cfg. ↩️ Undo grouped operation - wraps the apply process in an AutoCAD undo mark. Helper Functions 🧩 REBL:GetBlockNames scans available block names. 🔍 REBL:FilterNames applies wildcard filtering. 📋 REBL:ShowPreview displays replacement rules and counts. 🔁 REBL:ReplaceAll copies the replacement reference, applies selected source properties, and deletes the old source reference. Result ✅ The final result is a faster AutoCAD block cleanup workflow for replacing many drawing symbols, detail blocks, annotation blocks, and CAD standard blocks with controlled rule-based automation. 📊 The preview count and saved rules make repeated block replacement tasks easier to check, repeat, and manage. Important Notes ⚠️ The operation is destructive because old source block references are deleted after replacement copies are created. 📌 A replacement block must already have at least one inserted reference in the drawing because the tool copies the first matching replacement reference as the template. ⚙️ Only insertion point, rotation, and scale are optionally copied from the source reference. Other properties can come from the replacement template block reference. 🛡️ Review the preview list and keep an AutoCAD backup or use Undo when testing new replacement rules.