update comment on regex use for platform indipendent cosideration

Author: Smartsheet-JB-Brown

src/api/providers/bedrock.ts

@@ -541,24 +541,32 @@ export class AwsBedrockHandler extends BaseProvider implements SingleCompletionH
 	 * @returns An object with validation results: { isValid, arnRegion, errorMessage }
 	 */
 	private parseArn(arn: string, region?: string) {
-		// Use a single regex to capture the region and optional resource type/ID
-		// This matches ARNs like:
-		// Foundation Model: arn:aws:bedrock:us-west-2::foundation-model/anthropic.claude-v2
-		// Prompt Router: arn:aws:bedrock:us-west-2:123456789012:prompt-router/anthropic-claude
-		// Inference Profile: arn:aws:bedrock:us-west-2:123456789012:inference-profile/anthropic.claude-v2
-		// Cross Region Inference Profile: arn:aws:bedrock:us-west-2:123456789012:inference-profile/us.anthropic.claude-3-5-sonnet-20241022-v2:0
-		// Custom Model (Provisioned Throughput): arn:aws:bedrock:us-west-2:123456789012:provisioned-model/my-custom-model
-		// Imported Model: arn:aws:bedrock:us-west-2:123456789012:imported-model/my-imported-model
+		/*
+		 * VIA Roo analysis: platform-independent Regex. It's designed to parse AWS Bedrock ARNs and doesn't rely on any platform-specific features
+		 * like file path separators, line endings, or case sensitivity behaviors. The forward slashes in the regex are properly escaped and
+		 * represent literal characters in the AWS ARN format, not filesystem paths. This regex will function consistently across Windows,
+		 * macOS, Linux, and any other operating system where JavaScript runs.
+		 *
+		 *  This matches ARNs like:
+		 *  - Foundation Model: arn:aws:bedrock:us-west-2::foundation-model/anthropic.claude-v2
+		 *  - Prompt Router: arn:aws:bedrock:us-west-2:123456789012:prompt-router/anthropic-claude
+		 *  - Inference Profile: arn:aws:bedrock:us-west-2:123456789012:inference-profile/anthropic.claude-v2
+		 *  - Cross Region Inference Profile: arn:aws:bedrock:us-west-2:123456789012:inference-profile/us.anthropic.claude-3-5-sonnet-20241022-v2:0
+		 *  - Custom Model (Provisioned Throughput): arn:aws:bedrock:us-west-2:123456789012:provisioned-model/my-custom-model
+		 *  - Imported Model: arn:aws:bedrock:us-west-2:123456789012:imported-model/my-imported-model
+		 *
+		 * match[0] - The entire matched string
+		 * match[1] - The region (e.g., "us-east-1")
+		 * match[2] - The account ID (can be empty string for AWS-managed resources)
+		 * match[3] - The resource type (e.g., "foundation-model")
+		 * match[4] - The resource ID (e.g., "anthropic.claude-3-sonnet-20240229-v1:0")
+		 */
 
 		const arnRegex = /^arn:aws:bedrock:([^:]+):([^:]*):(?:([^\/]+)\/(.+)|([^\/]+))$/
 		let match = arn.match(arnRegex)
 
 		/*
-			match[0] - The entire matched string
-			match[1] - The region (e.g., "us-east-1")
-			match[2] - The account ID (can be empty string for AWS-managed resources)
-			match[3] - The resource type (e.g., "foundation-model")
-			match[4] - The resource ID (e.g., "anthropic.claude-3-sonnet-20240229-v1:0")
+
 		*/
 
 		if (match && match[1] && match[3] && match[4]) {