diff --git a/lib/config-utils.js b/lib/config-utils.js
index 845ce9e04..5b55a52ea 100644
--- a/lib/config-utils.js
+++ b/lib/config-utils.js
@@ -109,8 +109,14 @@ exports.Config = Config;
 // The intention is to only allow ** to appear when immediately
 // preceded and followed by a slash.
 const pathStarsRegex = /.*(?:\*\*[^/].*|\*\*$|[^/]\*\*.*)/;
+// Characters that are supported by filters in workflows, but not by us.
+// See https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions#filter-pattern-cheat-sheet
+const filterPatternCharactersRegex = /.*[\?\+\[\]!].*/;
+// Matches any string containing characters that are illegal to include in paths on windows
+exports.illegalWindowsCharactersRegex = /.*[<>:"\|?*].*/;
 // Checks that a paths of paths-ignore entry is valid, possibly modifying it
 // to make it valid, or if not possible then throws an error.
+// May also return undefined to indicate that the path should be ignored.
 function validateAndSanitisePath(originalPath, propertyName, configFile) {
     // Take a copy so we don't modify the original path, so we can still construct error messages
     let path = originalPath;
@@ -122,10 +128,23 @@ function validateAndSanitisePath(originalPath, propertyName, configFile) {
     if (path.endsWith('/**')) {
         path = path.substring(0, path.length - 2);
     }
+    // Check for illegal uses of **
     if (path.match(pathStarsRegex)) {
         throw new Error(getConfigFilePropertyError(configFile, propertyName, '"' + originalPath + '" contains an invalid "**" wildcard. ' +
             'They must be immediately preceeded and followed by a slash as in "/**/", or come at the start or end.'));
     }
+    // Check for other regex characters that we don't support.
+    // Output a warning so the user knows, but otherwise continue normally.
+    if (path.match(filterPatternCharactersRegex)) {
+        core.warning(getConfigFilePropertyError(configFile, propertyName, '"' + originalPath + '" contains an unsupported character. ' +
+            'The filter pattern characteres ?, +, [, ], ! are not supported and will be matched literally.'));
+    }
+    // Check for any characters that are illegal in path names
+    if (process.platform === 'win32' && path.match(exports.illegalWindowsCharactersRegex)) {
+        core.warning('"' + path + '" contains an invalid character and will be ignored. ' +
+            'The characteres <, >, :, ", !, |, ?, * are forbidden to use in paths on windows.');
+        return undefined;
+    }
     return path;
 }
 exports.validateAndSanitisePath = validateAndSanitisePath;
@@ -240,7 +259,10 @@ async function initConfig() {
             if (typeof path !== "string" || path === '') {
                 throw new Error(getPathsIgnoreInvalid(configFile));
             }
-            config.pathsIgnore.push(validateAndSanitisePath(path, PATHS_IGNORE_PROPERTY, configFile));
+            path = validateAndSanitisePath(path, PATHS_IGNORE_PROPERTY, configFile);
+            if (path !== undefined) {
+                config.pathsIgnore.push(path);
+            }
         });
     }
     if (PATHS_PROPERTY in parsedYAML) {
@@ -251,7 +273,10 @@ async function initConfig() {
             if (typeof path !== "string" || path === '') {
                 throw new Error(getPathsInvalid(configFile));
             }
-            config.paths.push(validateAndSanitisePath(path, PATHS_PROPERTY, configFile));
+            path = validateAndSanitisePath(path, PATHS_PROPERTY, configFile);
+            if (path !== undefined) {
+                config.paths.push(path);
+            }
         });
     }
     return config;
diff --git a/lib/config-utils.js.map b/lib/config-utils.js.map
index 6a4677bc2..5ba2020d8 100644
--- a/lib/config-utils.js.map
+++ b/lib/config-utils.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/src/config-utils.ts b/src/config-utils.ts
index 797efc8c8..b57b54e36 100644
--- a/src/config-utils.ts
+++ b/src/config-utils.ts
@@ -118,9 +118,21 @@ export class Config {
 // preceded and followed by a slash.
 const pathStarsRegex = /.*(?:\*\*[^/].*|\*\*$|[^/]\*\*.*)/;
 
+// Characters that are supported by filters in workflows, but not by us.
+// See https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions#filter-pattern-cheat-sheet
+const filterPatternCharactersRegex = /.*[\?\+\[\]!].*/;
+
+// Matches any string containing characters that are illegal to include in paths on windows
+export const illegalWindowsCharactersRegex = /.*[<>:"\|?*].*/;
+
 // Checks that a paths of paths-ignore entry is valid, possibly modifying it
 // to make it valid, or if not possible then throws an error.
-export function validateAndSanitisePath(originalPath: string, propertyName: string, configFile: string): string {
+// May also return undefined to indicate that the path should be ignored.
+export function validateAndSanitisePath(
+  originalPath: string,
+  propertyName: string,
+  configFile: string): string | undefined {
+
   // Take a copy so we don't modify the original path, so we can still construct error messages
   let path = originalPath;
 
@@ -134,6 +146,7 @@ export function validateAndSanitisePath(originalPath: string, propertyName: stri
     path = path.substring(0, path.length - 2);
   }
 
+  // Check for illegal uses of **
   if (path.match(pathStarsRegex)) {
     throw new Error(getConfigFilePropertyError(
       configFile,
@@ -141,6 +154,24 @@ export function validateAndSanitisePath(originalPath: string, propertyName: stri
       '"' + originalPath + '" contains an invalid "**" wildcard. ' +
         'They must be immediately preceeded and followed by a slash as in "/**/", or come at the start or end.'));
   }
+
+  // Check for other regex characters that we don't support.
+  // Output a warning so the user knows, but otherwise continue normally.
+  if (path.match(filterPatternCharactersRegex)) {
+    core.warning(getConfigFilePropertyError(
+      configFile,
+      propertyName,
+      '"' + originalPath + '" contains an unsupported character. ' +
+        'The filter pattern characteres ?, +, [, ], ! are not supported and will be matched literally.'));
+  }
+
+  // Check for any characters that are illegal in path names
+  if (process.platform === 'win32' && path.match(illegalWindowsCharactersRegex)) {
+    core.warning('"' + path + '" contains an invalid character and will be ignored. ' +
+        'The characteres <, >, :, ", !, |, ?, * are forbidden to use in paths on windows.');
+    return undefined;
+  }
+
   return path;
 }
 
@@ -274,7 +305,10 @@ async function initConfig(): Promise<Config> {
       if (typeof path !== "string" || path === '') {
         throw new Error(getPathsIgnoreInvalid(configFile));
       }
-      config.pathsIgnore.push(validateAndSanitisePath(path, PATHS_IGNORE_PROPERTY, configFile));
+      path = validateAndSanitisePath(path, PATHS_IGNORE_PROPERTY, configFile);
+      if (path !== undefined) {
+        config.pathsIgnore.push(path);
+      }
     });
   }
 
@@ -286,7 +320,10 @@ async function initConfig(): Promise<Config> {
       if (typeof path !== "string" || path === '') {
         throw new Error(getPathsInvalid(configFile));
       }
-      config.paths.push(validateAndSanitisePath(path, PATHS_PROPERTY, configFile));
+      path = validateAndSanitisePath(path, PATHS_PROPERTY, configFile);
+      if (path !== undefined) {
+        config.paths.push(path);
+      }
     });
   }