From 3706148c7945e09e39f265e13f0a40bb08feb56d Mon Sep 17 00:00:00 2001
From: Patrick Canterino <patrick@patrick-canterino.de>
Date: Thu, 30 Dec 2021 15:53:47 +0100
Subject: [PATCH] Allow to define exclusions based on regular expressions

Also, the databases matching the exclusions defined in $configDbExclude are now
removed later in the script. This means that when backing up a selection of
databases, $configDbExclude does not apply.
---
 TODO.md           |  2 +-
 psmysqlbackup.ps1 | 17 +++++++++++++++--
 2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/TODO.md b/TODO.md
index 5b21437..09e348c 100644
--- a/TODO.md
+++ b/TODO.md
@@ -4,7 +4,7 @@
 - [x] Allow to define exclusions
 - [x] Backup a selection of databases
 - [x] Rotate backups after `n` backups
-- [ ] Allow to define exclusions based on regular expressions
+- [x] Allow to define exclusions based on regular expressions
 - [ ] Error handling
 - [ ] Configuration file
 - [ ] Write log file
diff --git a/psmysqlbackup.ps1 b/psmysqlbackup.ps1
index f248efd..7e870ea 100644
--- a/psmysqlbackup.ps1
+++ b/psmysqlbackup.ps1
@@ -21,6 +21,7 @@ $configRotate = 7
 
 $configDbBackup = @()
 $configDbExclude = @("test")
+$configDbExcludePattern = @()
 
 # End of config
 
@@ -69,7 +70,7 @@ $defaultDbExclude = @("information_schema", "performance_schema")
 $currDaytime = Get-Date -format "yyyyMMdd-HHmmss"
 
 try {
-    $databases = Get-Databases | Where-Object {!($_ -in $defaultDbExclude -or $_ -in $configDbExclude)}
+    $databases = Get-Databases | Where-Object {!($_ -in $defaultDbExclude)}
 }
 catch {
     Write-Output "Failed to get list of databases"
@@ -90,7 +91,19 @@ if($configDbBackup -and $configDbBackup.count -gt 0) {
     }
 }
 else {
-    $databasesToBackup = $databases
+    :excludeOuter foreach($rDb in $databases) {
+        if($rDb -in $configDbExclude) {
+            continue;
+        }
+
+        foreach($cPattern in $configDbExcludePattern) {
+            if($rDb -match $cPattern) {
+                continue excludeOuter;
+            }
+        }
+
+        $databasesToBackup += $rDb
+    }
 }
 
 foreach($d in $databasesToBackup) {
-- 
2.34.1