From 524cb209fffc8fd97a6651a26a8eedceb8e8d82c Mon Sep 17 00:00:00 2001
From: Utkarsh Gupta <utkarshgupta137@gmail.com>
Date: Tue, 20 Oct 2026 11:38:19 +0100
Subject: [PATCH] Set regex pool_capacity

---
 engine/src/ast/parse.rs                | 25 +++++++++++++++++++++----
 engine/src/rhs_types/regex/imp_real.rs |  8 ++++----
 2 files changed, 25 insertions(+), 8 deletions(-)

diff --git a/engine/src/ast/parse.rs b/engine/src/ast/parse.rs
index a9b79ffc..d73b572a 100644
--- a/engine/src/ast/parse.rs
+++ b/engine/src/ast/parse.rs
@@ -97,12 +97,15 @@ impl Display for ParseError<'_> {
 /// Parser settings.
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub struct ParserSettings {
-    /// Approximate size of the cache used by the DFA of a regex.
-    /// Default: 10MB
-    pub regex_dfa_size_limit: usize,
     /// Approximate size limit of the compiled regular expression.
-    /// Default: 2MB
+    /// Default: 10MB
     pub regex_compiled_size_limit: usize,
+    /// Approximate size of the cache used by the DFA of a regex.
+    /// Default: 2MB
+    pub regex_dfa_size_limit: usize,
+    /// Capacity of the managed Cache pool.
+    /// Default: 8
+    pub regex_pool_capacity: usize,
     /// Maximum number of star metacharacters allowed in a wildcard.
     /// Default: unlimited
     pub wildcard_star_limit: usize,
@@ -119,6 +122,8 @@ impl Default for ParserSettings {
             regex_compiled_size_limit: 10 * (1 << 20),
             // Default value extracted from the regex crate.
             regex_dfa_size_limit: 2 * (1 << 20),
+            // Default value extracted from the regex crate.
+            regex_pool_capacity: 8,
             wildcard_star_limit: usize::MAX,
             max_nesting_depth: 128,
         }
@@ -227,6 +232,18 @@ impl<'s> FilterParser<'s> {
         self.settings.regex_dfa_size_limit
     }
 
+    /// Set capacity of the managed Cache pool.
+    #[inline]
+    pub fn regex_set_pool_capacity(&mut self, pool_capacity: usize) {
+        self.settings.regex_pool_capacity = pool_capacity;
+    }
+
+    /// Get capacity of the managed Cache pool.
+    #[inline]
+    pub fn regex_get_pool_capacity(&self) -> usize {
+        self.settings.regex_pool_capacity
+    }
+
     /// Set the maximum number of star metacharacters allowed in a wildcard.
     #[inline]
     pub fn wildcard_set_star_limit(&mut self, wildcard_star_limit: usize) {
diff --git a/engine/src/rhs_types/regex/imp_real.rs b/engine/src/rhs_types/regex/imp_real.rs
index 637539bc..ec821ad8 100644
--- a/engine/src/rhs_types/regex/imp_real.rs
+++ b/engine/src/rhs_types/regex/imp_real.rs
@@ -15,7 +15,7 @@ pub struct Regex {
 impl Regex {
     /// Retrieves the syntax configuration that will be used to build the regex.
     #[inline]
-    fn syntax_config() -> regex_automata::util::syntax::Config {
+    pub fn syntax_config() -> regex_automata::util::syntax::Config {
         regex_automata::util::syntax::Config::new()
             .unicode(false)
             .utf8(false)
@@ -23,15 +23,15 @@ impl Regex {
 
     /// Retrieves the meta configuration that will be used to build the regex.
     #[inline]
-    fn meta_config(settings: &ParserSettings) -> regex_automata::meta::Config {
+    pub fn meta_config(settings: &ParserSettings) -> regex_automata::meta::Config {
         regex_automata::meta::Config::new()
             .match_kind(MatchKind::LeftmostFirst)
             .utf8_empty(false)
             .dfa(false)
-            .nfa_size_limit(Some(settings.regex_compiled_size_limit))
             .onepass(false)
-            .dfa_size_limit(Some(settings.regex_compiled_size_limit))
+            .nfa_size_limit(Some(settings.regex_compiled_size_limit))
             .hybrid_cache_capacity(settings.regex_dfa_size_limit)
+            .pool_capacity(settings.regex_pool_capacity)
             .which_captures(WhichCaptures::None)
     }