fix(checkver): Correct variable 'regex' to 'regexp' (#5993)

Author: chawyehsu

CHANGELOG.md

@@ -16,6 +16,7 @@
 - **scoop-download|install|update:** Use consistent options ([#5956](https://github.com/ScoopInstaller/Scoop/issues/5956))
 - **core:** Fix "Invoke-ExternalCommand" quoting rules ([#5945](https://github.com/ScoopInstaller/Scoop/issues/5945))
 - **scoop-info:** Fix download size estimating ([#5958](https://github.com/ScoopInstaller/Scoop/issues/5958))
+- **checkver:** Correct variable 'regex' to 'regexp' ([#5993](https://github.com/ScoopInstaller/Scoop/issues/5993))
 
 ### Code Refactoring
 

bin/checkver.ps1

@@ -275,7 +275,7 @@ while ($in_progress -gt 0) {
     $ver = $Version
 
     if (!$ver) {
-        if (!$regex -and $replace) {
+        if (!$regexp -and $replace) {
             next "'replace' requires 're' or 'regex'"
             continue
         }
@@ -300,7 +300,7 @@ while ($in_progress -gt 0) {
 
         if ($jsonpath) {
             # Return only a single value if regex is absent
-            $noregex = [String]::IsNullOrEmpty($regex)
+            $noregex = [String]::IsNullOrEmpty($regexp)
             # If reverse is ON and regex is ON,
             # Then reverse would have no effect because regex handles reverse
             # on its own
@@ -348,19 +348,19 @@ while ($in_progress -gt 0) {
         }
 
         if ($regexp) {
-            $regex = New-Object System.Text.RegularExpressions.Regex($regexp)
+            $re = New-Object System.Text.RegularExpressions.Regex($regexp)
             if ($reverse) {
-                $match = $regex.Matches($page) | Select-Object -Last 1
+                $match = $re.Matches($page) | Select-Object -Last 1
             } else {
-                $match = $regex.Matches($page) | Select-Object -First 1
+                $match = $re.Matches($page) | Select-Object -First 1
             }
 
             if ($match -and $match.Success) {
                 $matchesHashtable = @{}
-                $regex.GetGroupNames() | ForEach-Object { $matchesHashtable.Add($_, $match.Groups[$_].Value) }
+                $re.GetGroupNames() | ForEach-Object { $matchesHashtable.Add($_, $match.Groups[$_].Value) }
                 $ver = $matchesHashtable['1']
                 if ($replace) {
-                    $ver = $regex.Replace($match.Value, $replace)
+                    $ver = $re.Replace($match.Value, $replace)
                 }
                 if (!$ver) {
                     $ver = $matchesHashtable['version']