From d704ec1faba91ffd6bea45bad18d4a9aa6ea8de4 Mon Sep 17 00:00:00 2001
From: Nipun Shah <nipunshah6776@gmail.com>
Date: Mon, 20 Jun 2022 23:42:07 +0530
Subject: [PATCH] Feature : new methods for string - digits, letters,
 alphanumeric

---
 lib/src/string.dart | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/lib/src/string.dart b/lib/src/string.dart
index 050d589..cb62a7f 100644
--- a/lib/src/string.dart
+++ b/lib/src/string.dart
@@ -295,3 +295,35 @@ String buildString(void Function(StringBuffer sb) builderAction) {
   builderAction(buffer);
   return buffer.toString();
 }
+
+extension StringIsLetterOrDigits on String {
+  /// Returns `true` if all the characters in string are digits & there is atleast 1 character,
+  /// `false` elseways
+  bool get isDigit {
+    if (isBlank) {
+      return false;
+    }
+    final regex = RegExp(r'^\d+$');
+    return regex.hasMatch(this);
+  }
+
+  /// Returns `true` if all the characters in string are letters & there is atleast 1 character,
+  /// `false` elseways
+  bool get isAlpha {
+    if (isBlank) {
+      return false;
+    }
+    final regex = RegExp(r'^[a-zA-Z]+$');
+    return regex.hasMatch(this);
+  }
+
+  /// Returns `true` if all the characters in string are either digits or letters
+  /// & there is atleast 1 character, `false` elseways
+  bool get isAlNum {
+    if (isBlank) {
+      return false;
+    }
+    final regex = RegExp(r'^[a-zA-Z0-9]+$');
+    return regex.hasMatch(this);
+  }
+}