fix: The `format` validator incorrectly rejecting supported regex patterns

Ref: #230

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Fixed
+
+- The `format` validator incorrectly rejecting supported regex patterns. [#230](https://github.com/Stranger6667/jsonschema-rs/issues/230)
+
 ## [0.9.0] - 2021-05-07
 
 ### Added

bindings/python/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Fixed
+
+- The `format` validator incorrectly rejecting supported regex patterns. [#230](https://github.com/Stranger6667/jsonschema-rs/issues/230)
+
 ## [0.9.0] - 2021-05-07
 
 ### Added

jsonschema/src/keywords/format.rs

@@ -2,7 +2,7 @@
 use crate::{
     compilation::{context::CompilationContext, JSONSchema},
     error::{error, no_error, CompilationError, ErrorIterator, ValidationError},
-    keywords::CompilationResult,
+    keywords::{pattern, CompilationResult},
     paths::InstancePath,
     validator::Validate,
     Draft,
@@ -267,7 +267,7 @@ impl Validate for RegexValidator {
     validate!("regex");
     fn is_valid(&self, _: &JSONSchema, instance: &Value) -> bool {
         if let Value::String(item) = instance {
-            Regex::new(item).is_ok()
+            pattern::convert_regex(item).is_ok()
         } else {
             true
         }
@@ -381,4 +381,13 @@ mod tests {
         let compiled = JSONSchema::compile(&schema).unwrap();
         assert!(compiled.is_valid(&instance))
     }
+
+    #[test]
+    fn ecma_regex() {
+        // See GH-230
+        let schema = json!({"format": "regex", "type": "string"});
+        let instance = json!("^\\cc$");
+        let compiled = JSONSchema::compile(&schema).unwrap();
+        assert!(compiled.is_valid(&instance))
+    }
 }

jsonschema/src/keywords/pattern.rs

@@ -80,7 +80,7 @@ impl ToString for PatternValidator {
 }
 
 // ECMA 262 has differences
-fn convert_regex(pattern: &str) -> Result<fancy_regex::Regex, fancy_regex::Error> {
+pub(crate) fn convert_regex(pattern: &str) -> Result<fancy_regex::Regex, fancy_regex::Error> {
     // replace control chars
     let new_pattern = CONTROL_GROUPS_RE.replace_all(pattern, replace_control_group);
     let mut out = String::with_capacity(new_pattern.len());