Migrate from std/nre -> nitely/regex

std/nre depends on PCRE v1 which is being deprecated by a number of
major distributions (Debian specifically). The core Nim team does not
have a plan currently to migrate it to PCRE v2. nitely/regex is a
Nim-native PCRE-compatible replacement.

AI-Assisted: yes
AI-Tool: codex gpt-5.4 xhigh

short_url.nimble

@@ -1,6 +1,6 @@
 # Package
 
-version       = "1.0.0"
+version       = "1.0.1"
 author        = "Jonathan Bernard"
 description   = "URL shortener/expander for Probatem at https://pbtm.us"
 license       = "GPL3"
@@ -11,7 +11,7 @@ bin           = @["short_url"]
 # Dependencies
 
 requires "nim >= 2.2.4"
-requires @["cliutils", "mummy", "namespaced_logging >= 2.1.2", "webby"]
+requires @["cliutils", "mummy", "namespaced_logging >= 2.1.2", "regex", "webby"]
 
 task updateVersion, "Update the version of this package.":
   exec "update_version interactive src/short_url.nim"

src/short_url.nim

@@ -1,5 +1,5 @@
-import std/[json, nre, posix, sequtils, strutils]
-import cliutils, docopt, mummy, namespaced_logging
+import std/[json, posix, sequtils, strutils]
+import cliutils, docopt, mummy, namespaced_logging, regex
 import webby/httpheaders
 
 const USAGE = """
@@ -14,7 +14,7 @@ Options:
   --trace                   Enable trace-level logging (takes precedence over --debug).
 """
 
-const VERSION = "1.0.0"
+const VERSION = "1.0.1"
 const CT_TXT = "text/plain"
 
 type
@@ -24,7 +24,7 @@ type
     cfg: CombinedConfig
 
   Context = object
-    mappings: seq[tuple[src:string, regex: Regex, tmpl: string]]
+    mappings: seq[tuple[src:string, regex: Regex2, tmpl: string]]
     logger: Logger
 
 proc loadConfig(args: Table[string, Value]): ShortUrlsConfig =
@@ -40,8 +40,8 @@ proc loadConfig(args: Table[string, Value]): ShortUrlsConfig =
     result.mappings.add((k, v.getStr))
 
 proc initMappings(m: seq[tuple[src, dst: string]]):
-  seq[tuple[src: string, regex: Regex, tmpl: string]] =
-  result = m.mapIt((it.src, re(it.src), it.dst))
+  seq[tuple[src: string, regex: Regex2, tmpl: string]] =
+  result = m.mapIt((it.src, re2(it.src), it.dst))
 
 proc makeHandler(mappings: seq[tuple[src,dst: string]], logSvc: LogService): RequestHandler =
   let ctx = Context(
@@ -56,7 +56,7 @@ proc makeHandler(mappings: seq[tuple[src,dst: string]], logSvc: LogService): Req
       return
 
     for (src, regex, tmpl) in ctx.mappings:
-      if match(req.uri, regex).isSome:
+      if req.uri.startsWith(regex):
         ctx.logger.debug(%*{
           "msg": "found match",
           "matching_pattern": %src,