avm2: Implement missing AS3 RegExp features

Author: evilpie

Cargo.lock

@@ -41,7 +41,7 @@ rand = { version = "0.8.5", features = ["std", "small_rng"], default-features =
 serde = { workspace = true }
 serde_json = { version = "1.0", features = ["preserve_order"] }
 nellymoser-rs = { git = "https://github.com/ruffle-rs/nellymoser", rev = "073eb48d907201f46dea0c8feb4e8d9a1d92208c", optional = true }
-regress = "0.10"
+regress = { git = "https://github.com/evilpie/regress", branch = "as3" }
 flash-lso = { git = "https://github.com/ruffle-rs/rust-flash-lso", rev = "a5e938d9bb1909095f2340c2435867f6aae930b0" }
 lzma-rs = {version = "0.3.0", optional = true }
 dasp = { version = "0.11.0", features = ["interpolate", "interpolate-linear", "signal"], optional = true }

core/Cargo.toml

@@ -219,27 +219,36 @@ pub fn exec<'gc>(
             .unwrap_or(&Value::Undefined)
             .coerce_to_string(activation)?;
 
-        let (storage, index) = match re.exec(text) {
-            Some(matched) => {
-                let substrings = matched
-                    .groups()
-                    .map(|range| range.map(|r| WString::from(&text[r])));
-
-                let storage = ArrayStorage::from_iter(substrings.map(|s| match s {
-                    None => Value::Undefined,
-                    Some(s) => AvmString::new(activation.gc(), s).into(),
-                }));
-
-                (storage, matched.start())
-            }
+        let matched = match re.exec(text) {
+            Some(matched) => matched,
             None => return Ok(Value::Null),
         };
 
+        let substrings = matched
+            .groups()
+            .map(|range| range.map(|r| WString::from(&text[r])));
+
+        let storage = ArrayStorage::from_iter(substrings.map(|s| match s {
+            None => Value::Undefined,
+            Some(s) => AvmString::new(activation.gc(), s).into(),
+        }));
+
         let object = ArrayObject::from_storage(activation, storage);
 
+        for (name, range) in matched.named_groups() {
+            if let Some(range) = range {
+                let substring = AvmString::new(activation.gc(), &text[range]);
+                object.set_string_property_local(
+                    AvmString::new_utf8(activation.gc(), name),
+                    substring.into(),
+                    activation,
+                )?;
+            }
+        }
+
         object.set_string_property_local(
             istr!("index"),
-            Value::Number(index as f64),
+            Value::Number(matched.start() as f64),
             activation,
         )?;
 

core/src/avm2/globals/reg_exp.rs

@@ -100,6 +100,7 @@ impl<'gc> RegExp<'gc> {
                     icase: self.flags.contains(RegExpFlags::IGNORE_CASE),
                     multiline: self.flags.contains(RegExpFlags::MULTILINE),
                     dot_all: self.flags.contains(RegExpFlags::DOTALL),
+                    extended: self.flags.contains(RegExpFlags::EXTENDED),
                     no_opt: false,
                     unicode: false,
                     unicode_sets: false,