diff --git a/.gitignore b/.gitignore
index a401266..f1e4f28 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,3 +18,7 @@ doc/
 
 # Mac
 .DS_Store
+
+# Others
+.fvm/
+.fvmrc
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4cb11c0..6d9df8b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,13 @@
+## 2.4.0
+
+- Bump minimum Dart SDK version to 3.2.0.
+- Add `parseSync()` to TextParser.
+- Update tests to use `parseSync()` instead of `parse()`.
+- Refactorings:
+    - Rename internal `Parser` to `ParserBody`.
+    - Add new `Parser` extending `ParserBody` to each of the files for web and non-web.
+    - Move TextParser from the root to `src/`.
+
 ## 2.3.0
 
 - Change `matchers` of TextParser from `List` to `Iterable`.
diff --git a/README.md b/README.md
index f697a5d..c1e0b7b 100644
--- a/README.md
+++ b/README.md
@@ -48,8 +48,7 @@ TextElement(matcherType: TelMatcher, matcherIndex 2, offset: 61, text: +1-012-34
 ```
 
 The regular expression pattern of each of them is not very strict. If it does not meet
-your use case, overwrite the pattern by yourself to make it stricter, referring to the
-relevant section later in this document.
+your use case, overwrite the pattern by yourself to make it stricter.
 
 #### parse() vs parseSync()
 
@@ -71,8 +70,8 @@ etc). If you want them to be matched too, use [UrlLikeMatcher] instead.
 
 #### matcherType and matcherIndex
 
-`matcherType` contained in a [TextElement] object is the type of the matcher used
-to parse the text into the element. `matcherIndex` is the index of the matcher in
+`matcherType` contained in a [TextElement] object is the type of the matcher that
+was used to extract the element. `matcherIndex` is the index of the matcher in
 the matcher list passed to the `matchers` argument of [TextParser].
 
 #### Extracting only matching text elements
@@ -109,7 +108,7 @@ final telElements = elements.map((elm) => elm.matcherType == TelMatcher).toList(
 
 #### Conflict between matchers
 
-If multiple matchers have matched the string at the same position in text, the first one
+If multiple matchers match the string at the same position in text, the first one
 in those matchers takes precedence.
 
 ```dart
@@ -121,18 +120,12 @@ In this example, `UrlLikeMatcher` matches `foo.bar` and `EmailMatcher` matches
 `foo.bar@example.com`, but `UrlLikeMatcher` is used because it is written before
 `EmailMatcher` in the matchers list.
 
-### Overwriting the pattern of an existing matcher
+### Overwriting the pattern of a preset matcher
 
-If you want to parse only URLs and phone numbers, but treat only a sequence of eleven numbers
-after "tel:" as a phone number:
+If you want to parse a sequence of eleven numbers after "tel:" as a phone number:
 
 ```dart
-final parser = TextParser(
-  matchers: const [
-    UrlMatcher(),
-    TelMatcher(r'(?<=tel:)\d{11}'),
-  ],
-);
+TelMatcher(r'(?<=tel:)\d{11}')
 ```
 
 ### Using a custom pattern
@@ -189,8 +182,8 @@ Output:
 ### ExactMatcher
 
 `ExactMatcher` escapes reserved characters of RegExp so that those are used
-as ordinary characters. The parser extracts the substrings that exactly match
-any of the strings in the passed list.
+as regular characters. The parser extracts the substrings that exactly match
+any of the strings in the list passed as the argument.
 
 ```dart
 TextParser(
@@ -251,16 +244,8 @@ How a regular expression is treated can be configured in the `TextParser` constr
 - unicode
 - dotAll
 
-These options are passed to [RegExp][RegExp] internally, so refer to its
-[document][RegExp_constructor] for information.
-
-## Limitations
-
-- This package uses regular expressions. The speed of parsing is subject to the
-  performance of `RegExp` in Dart. It will take more time to parse longer text with
-  multiple complex match patterns.
-- On the web, parsing is always executed in the main thread because Flutter Web does
-  not support [dart:isolate][isolate].
+These options are passed to the constructor of [RegExp][RegExp] internally, so
+refer to its [document][RegExp_constructor] for information.
 
 [TextParser]: https://pub.dev/documentation/text_parser/latest/text_parser/TextParser-class.html
 [TextParser_matchers]: https://pub.dev/documentation/text_parser/latest/text_parser/TextParser/matchers.html
diff --git a/lib/src/element.dart b/lib/src/element.dart
index 0842c64..fe0ad2d 100644
--- a/lib/src/element.dart
+++ b/lib/src/element.dart
@@ -113,7 +113,6 @@ extension on List<String?> {
         return false;
       }
     }
-
     return true;
   }
 }
diff --git a/lib/src/parser_body.dart b/lib/src/parser_body.dart
index 2655cb4..eed0f8c 100644
--- a/lib/src/parser_body.dart
+++ b/lib/src/parser_body.dart
@@ -20,9 +20,9 @@ class ParserBody {
   final bool dotAll;
 
   late Iterable<TextMatcher> _matchers;
+  late String _pattern;
   final List<String> _matcherGroupNames = [];
   final List<List<int>> _matcherGroupRanges = [];
-  late String _pattern;
 
   List<TextMatcher> get matchers => List.unmodifiable(_matchers);
 
diff --git a/pubspec.yaml b/pubspec.yaml
index 3626612..51afa0c 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,11 +1,12 @@
 name: text_parser
 description: A Dart package for flexibly parsing text into easy-to-handle format according to multiple regular expression patterns.
-version: 2.3.0
+version: 2.4.0
 repository: https://github.com/kaboc/dart_text_parser
 
 topics:
   - text
   - parser
+  - parsing
 
 environment:
   sdk: '>=3.2.0 <4.0.0'