feature2 implemented bug needs to be addressed

canvas/src/validation/mod.rs

@@ -1,13 +1,16 @@
+// src/validation/mod.rs
 //! Validation module for canvas form fields
 
 pub mod config;
 pub mod limits;
 pub mod state;
+pub mod patterns;
 
 // Re-export main types
 pub use config::{ValidationConfig, ValidationResult, ValidationConfigBuilder};
 pub use limits::{CharacterLimits, LimitCheckResult};
 pub use state::{ValidationState, ValidationSummary};
+pub use patterns::{PatternFilters, PositionFilter, PositionRange, CharacterFilter};
 
 /// Validation error types
 #[derive(Debug, Clone, thiserror::Error)]
@@ -18,6 +21,9 @@ pub enum ValidationError {
     #[error("Invalid character '{char}' at position {position}")]
     InvalidCharacter { char: char, position: usize },
     
+    #[error("Pattern validation failed: {message}")]
+    PatternValidationFailed { message: String },
+    
     #[error("Validation configuration error: {message}")]
     ConfigurationError { message: String },
 }