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Author: martijn00

CHANGELOG.md

@@ -14,6 +14,10 @@
 * Add date range
 * Add must be true
 * Add must be false
+* Add special characters
+* Add numeric characters
+* Add lowercase characters
+* Add uppercase characters
 
 ## 10.0.2
 * Reland generated l10n files

README.md

@@ -77,7 +77,10 @@ Available built-in validators include:
 - `FormBuilderValidators.fileSize()` - requires the field's to be less than the max size.
 - `FormBuilderValidators.mustBeTrue()` - requires the field's to be true.
 - `FormBuilderValidators.mustBeFalse()` - requires the field's to be false.
-
+- `FormBuilderValidators.hasSpecialChars()` - requires the field's to contain a specified number of special characters.
+- `FormBuilderValidators.hasUppercaseChars()` - requires the field's to contain a specified number of uppercase characters.
+- `FormBuilderValidators.hasLowercaseChars()` - requires the field's to contain a specified number of lowercase characters.
+- `FormBuilderValidators.hasNumericChars()` - requires the field's to contain a specified number of numeric characters.
 ### Supported languages
 
 Validators support default `errorText` messages in these languages:

lib/l10n/intl_en.arb

@@ -29,5 +29,9 @@
   "fileSizeErrorText": "File size must be less than {maxSize} while it is {fileSize}",
   "dateRangeErrorText": "Date must be in range {min} - {max}",
   "mustBeTrueErrorText": "This field must be true.",
-  "mustBeFalseErrorText": "This field must be false."
+  "mustBeFalseErrorText": "This field must be false.",
+  "containsSpecialCharErrorText": "Value must contain at least {min} special characters.",
+  "containsUppercaseCharErrorText": "Value must contain at least {min} uppercase characters.",
+  "containsLowercaseCharErrorText": "Value must contain at least {min} lowercase characters.",
+  "containsNumberErrorText": "Value must contain at least {min} numbers."
 }

lib/src/form_builder_validators.dart

@@ -512,4 +512,51 @@ class FormBuilderValidators {
       (valueCandidate) => valueCandidate != false
           ? errorText ?? FormBuilderLocalizations.current.mustBeFalseErrorText
           : null;
+
+  /// [FormFieldValidator] that requires the field's value to contain an amount of special characters.
+  static FormFieldValidator<String> hasSpecialChars({
+    int atLeast = 1,
+    String? errorText,
+  }) =>
+      (valueCandidate) => true == valueCandidate?.isNotEmpty &&
+              specialCharLength(valueCandidate!) >= atLeast
+          ? errorText ??
+              FormBuilderLocalizations.current
+                  .containsSpecialCharErrorText(atLeast)
+          : null;
+
+  /// [FormFieldValidator] that requires the field's value to contain an amount of uppercase characters.
+  static FormFieldValidator<String> hasUppercaseChars({
+    int atLeast = 1,
+    String? errorText,
+  }) =>
+      (valueCandidate) => true == valueCandidate?.isNotEmpty &&
+              uppercaseCharLength(valueCandidate!) >= atLeast
+          ? errorText ??
+              FormBuilderLocalizations.current
+                  .containsUppercaseCharErrorText(atLeast)
+          : null;
+
+  /// [FormFieldValidator] that requires the field's value to contain an amount of lowercase characters.
+  static FormFieldValidator<String> hasLowercaseChars({
+    int atLeast = 1,
+    String? errorText,
+  }) =>
+      (valueCandidate) => true == valueCandidate?.isNotEmpty &&
+              lowercaseCharLength(valueCandidate!) >= atLeast
+          ? errorText ??
+              FormBuilderLocalizations.current
+                  .containsLowercaseCharErrorText(atLeast)
+          : null;
+
+  /// [FormFieldValidator] that requires the field's value to contain an amount of numeric characters.
+  static FormFieldValidator<String> hasNumericChars({
+    int atLeast = 1,
+    String? errorText,
+  }) =>
+      (valueCandidate) => true == valueCandidate?.isNotEmpty &&
+              numberCharLength(valueCandidate!) >= atLeast
+          ? errorText ??
+              FormBuilderLocalizations.current.containsNumberErrorText(atLeast)
+          : null;
 }

lib/src/utils/helpers.dart

@@ -32,4 +32,4 @@ String formatBytes(int bytes) {
   }
   // Truncate to 1 decimal place
   return '${size.toStringAsFixed(1)}${suffixes[i]}';
-}
+}

lib/src/utils/validators.dart

@@ -328,3 +328,19 @@ bool isColorCode(String value,
   }
   return false;
 }
+
+int uppercaseCharLength(String value) {
+  return value.replaceAll(RegExp(r'[^A-Z]'), '').length;
+}
+
+int lowercaseCharLength(String value) {
+  return value.replaceAll(RegExp(r'[^a-z]'), '').length;
+}
+
+int numberCharLength(String value) {
+  return value.replaceAll(RegExp(r'[^0-9]'), '').length;
+}
+
+int specialCharLength(String value) {
+  return value.replaceAll(RegExp(r'[A-Za-z0-9]'), '').length;
+}