From 68a7634228883a951f25e12a816796a59ca66499 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@koston.org>
Date: Sun, 7 Dec 2025 15:33:15 -0600
Subject: [PATCH] [text] Store pattern as const char* to reduce memory usage
 (#12335)

---
 esphome/components/template/text/template_text.cpp |  2 +-
 esphome/components/text/text_traits.h              | 10 +++++-----
 esphome/components/web_server/web_server.cpp       |  2 +-
 esphome/components/web_server/web_server_v1.cpp    |  2 +-
 4 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/esphome/components/template/text/template_text.cpp b/esphome/components/template/text/template_text.cpp
index 556abbbd8..32ed8f047 100644
--- a/esphome/components/template/text/template_text.cpp
+++ b/esphome/components/template/text/template_text.cpp
@@ -15,7 +15,7 @@ void TemplateText::setup() {
     uint32_t key = this->get_preference_hash();
     key += this->traits.get_min_length() << 2;
     key += this->traits.get_max_length() << 4;
-    key += fnv1_hash(this->traits.get_pattern()) << 6;
+    key += fnv1_hash(this->traits.get_pattern_c_str()) << 6;
     this->pref_->setup(key, value);
   }
   if (!value.empty())
diff --git a/esphome/components/text/text_traits.h b/esphome/components/text/text_traits.h
index ceaba2dea..473daafb8 100644
--- a/esphome/components/text/text_traits.h
+++ b/esphome/components/text/text_traits.h
@@ -1,8 +1,7 @@
 #pragma once
 
-#include <utility>
+#include <string>
 
-#include "esphome/core/helpers.h"
 #include "esphome/core/string_ref.h"
 
 namespace esphome {
@@ -22,8 +21,9 @@ class TextTraits {
   int get_max_length() const { return this->max_length_; }
 
   // Set/get the pattern.
-  void set_pattern(std::string pattern) { this->pattern_ = std::move(pattern); }
-  std::string get_pattern() const { return this->pattern_; }
+  void set_pattern(const char *pattern) { this->pattern_ = pattern; }
+  std::string get_pattern() const { return std::string(this->pattern_); }
+  const char *get_pattern_c_str() const { return this->pattern_; }
   StringRef get_pattern_ref() const { return StringRef(this->pattern_); }
 
   // Set/get the frontend mode.
@@ -33,7 +33,7 @@ class TextTraits {
  protected:
   int min_length_;
   int max_length_;
-  std::string pattern_;
+  const char *pattern_{""};
   TextMode mode_{TEXT_MODE_TEXT};
 };
 
diff --git a/esphome/components/web_server/web_server.cpp b/esphome/components/web_server/web_server.cpp
index 1f3605a08..ca3aa21a9 100644
--- a/esphome/components/web_server/web_server.cpp
+++ b/esphome/components/web_server/web_server.cpp
@@ -1211,7 +1211,7 @@ std::string WebServer::text_json(text::Text *obj, const std::string &value, Json
   set_json_icon_state_value(root, obj, "text", state, value, start_config);
   root[ESPHOME_F("min_length")] = obj->traits.get_min_length();
   root[ESPHOME_F("max_length")] = obj->traits.get_max_length();
-  root[ESPHOME_F("pattern")] = obj->traits.get_pattern();
+  root[ESPHOME_F("pattern")] = obj->traits.get_pattern_c_str();
   if (start_config == DETAIL_ALL) {
     root[ESPHOME_F("mode")] = (int) obj->traits.get_mode();
     this->add_sorting_info_(root, obj);
diff --git a/esphome/components/web_server/web_server_v1.cpp b/esphome/components/web_server/web_server_v1.cpp
index 870a33862..486c38a2a 100644
--- a/esphome/components/web_server/web_server_v1.cpp
+++ b/esphome/components/web_server/web_server_v1.cpp
@@ -142,7 +142,7 @@ void WebServer::handle_index_request(AsyncWebServerRequest *request) {
         stream.print(R"(" maxlength=")");
         stream.print(text->traits.get_max_length());
         stream.print(R"(" pattern=")");
-        stream.print(text->traits.get_pattern().c_str());
+        stream.print(text->traits.get_pattern_c_str());
         stream.print(R"(" value=")");
         stream.print(text->state.c_str());
         stream.print(R"("/>)");