Validate an ElastiCache cache or cluster name. Rules: - 1 to 40 characters - Alphanumeric characters and hyphens only - Must start wi

r"""Validate an engine version string. Accepted formats: - Major only: "7" (used by serverless MajorEngineVersion) - Major.minor: "7.1",

Validate a KMS key ID. Accepts either: - A UUID: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx - A KMS key ARN: arn:aws:kms:<region>:<account>:key

Validate an AWS region code (e.g. us-east-1, eu-west-2, ap-southeast-1).

Validate a replication group ID. Same rules as cache name: 1-40 chars, alphanumeric + hyphens, starts with a letter, no consecutive hyphens,

Validate an AWS security group ID (sg-<8-17 hex chars>).

Validate a snapshot name. Rules: - 1 to 255 characters for serverless snapshots, 1 to 40 for node-based - Alphanumeric characters and hyp

Validate an AWS subnet ID (subnet-<8-17 hex chars>).

Validate an AWS VPC ID (vpc-<8-17 hex chars>).

Fetch a URL, automatically settling any x402 402 Payment Required response. Returns a JSON string with status_code, body, and (on payment) paymen