Revert "Revert to see benchmark"

This reverts commit 213468e.

crates/oxc_linter/src/rules/eslint/no_invalid_regexp.rs

@@ -1,6 +1,6 @@
 use oxc_allocator::Allocator;
 use oxc_ast::{ast::Argument, AstKind};
-use oxc_diagnostics::OxcDiagnostic;
+use oxc_diagnostics::{LabeledSpan, OxcDiagnostic};
 use oxc_macros::declare_oxc_lint;
 use oxc_regular_expression::{FlagsParser, ParserOptions, PatternParser};
 use oxc_span::Span;
@@ -81,17 +81,27 @@ impl Rule for NoInvalidRegexp {
             // For compatibility with ESLint, we need to check "user-defined duplicated" flags here
             // "valid duplicated" flags are also checked
             let mut unique_flags = FxHashSet::default();
+            let mut violations = vec![];
             for (idx, ch) in flags_text.char_indices() {
                 if !unique_flags.insert(ch) {
-                    #[allow(clippy::cast_possible_truncation)]
-                    let span_start = flags_span_start + idx as u32;
-                    return ctx.diagnostic(
-                        // Use the same prefix with `oxc_regular_expression`
-                        OxcDiagnostic::warn("Invalid regular expression: Duplicated flag")
-                            .with_label(Span::new(span_start, span_start)),
-                    );
+                    violations.push(idx);
                 }
             }
+            if !violations.is_empty() {
+                return ctx.diagnostic(
+                    // Use the same prefix with `oxc_regular_expression`
+                    OxcDiagnostic::warn("Invalid regular expression: Duplicated flag").with_labels(
+                        violations
+                            .iter()
+                            .map(|&start| {
+                                #[allow(clippy::cast_possible_truncation)]
+                                let start = flags_span_start + start as u32;
+                                LabeledSpan::new_with_span(None, Span::new(start, start))
+                            })
+                            .collect::<Vec<_>>(),
+                    ),
+                );
+            }
 
             // Omit user defined invalid flags
             for flag in &self.0.allow_constructor_flags {