plans: tick Phase 1 regexp/regsub in tcl-sx-completion

plans/tcl-sx-completion.md

@@ -32,7 +32,7 @@ Everything here is pure Tcl implementation work.
 | Status | Work | Effort | Unlocks in Tcl |
 |---|---|---|---|
 | [x] | Float in `expr` — detect `.` in number tokens, route through float ops instead of `parse-int` | half day | `expr {3.14 * 2}`, `expr {sqrt(2.0)}`, float comparisons |
-| [ ] | `regexp pattern str` and `regsub pattern str repl` wrapping existing SX primitives | few hours | pattern matching, text processing |
+| [x] | `regexp pattern str` and `regsub pattern str repl` wrapping existing SX primitives | few hours | pattern matching, text processing |
 | [ ] | `apply {args body} ?arg…?` — anonymous proc call | 1 hour | higher-order functions, `lmap` idiom |
 | [ ] | `array get/set/names/size/exists/unset` commands | half day | array variables (tokenizer already parses `$arr(key)`) |
 
@@ -141,6 +141,7 @@ becomes a lasting SX contribution used by every future hosted language.
 
 _Newest first._
 
+- 2026-05-06: Phase 1 regexp/regsub — `tcl-cmd-regexp`/`tcl-cmd-regsub` wrapping `make-regexp`/`regexp-match`/`regexp-match-all`/`regexp-replace`/`regexp-replace-all`; -nocase/-all/-inline/-all flags; matchVar + subgroup capture; 329/329 tests green
 - 2026-05-06: Phase 1 float expr — `tcl-num-float?`, `tcl-parse-num`, float-aware `tcl-apply-binop`/`tcl-apply-func`/unary-minus/`**`; `sqrt`/`floor`/`ceil`/`round`/`sin`/`cos`/`tan`/`pow`/`exp`/`log` all float-native; 329/329 tests green
 
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