Change DECIMAL_REGEX to support floats that start with a dot

library/CHANGELOG.md

@@ -32,6 +32,7 @@ All notable changes to the library will be documented in this file.
 - Change `ISO_DATE_TIME_REGEX` and `ISO_TIMESTAMP_REGEX` to support space as separator (pull request #1064)
 - Change pipe tuple of `pipe` and `pipeAsync` to be readonly by default
 - Change `forward`, `forwardCheck`, `partialCheck` and `partialCheckAsync` to improve TypeScript performance (issue #987)
+- Change `DECIMAL_REGEX` to support floats that start with a dot (pull request #1086)
 - Refactor `bytes`, `maxBytes`, `minBytes` and `notBytes` action
 - Fix implementation of `nonOptional`, `nonOptionalAsync`, `nonNullable`, `nonNullableAsync`, `nonNullish` and `nonNullishAsync` schema in edge cases (issue #909)
 - Fix instantiation error for `any` in `PathKeys` type (issue #929)

library/src/actions/decimal/decimal.test.ts

@@ -73,20 +73,32 @@ describe('decimal', () => {
       expectNoActionIssue(action, ['00', '01', '12', '99']);
     });
 
+    test('for multiple digits', () => {
+      expectNoActionIssue(action, ['1234', '0123456789']);
+    });
+
     test('for float numbers', () => {
       expectNoActionIssue(action, ['0.1', '123.456']);
     });
 
     test('for number signs', () => {
-      expectNoActionIssue(action, ['+1', '-1', '+123', '-123']);
+      expectNoActionIssue(action, ['+1', '-1', '+123', '-123', '+001', '-001']);
     });
 
-    test('for float numbers with a number sign', () => {
+    test('for floats with a number sign', () => {
       expectNoActionIssue(action, ['-2.0', '-52.61', '+4.0', '-11.31']);
     });
 
-    test('for multiple digits', () => {
-      expectNoActionIssue(action, ['0123456789']);
+    test('for floats starting with a dot', () => {
+      expectNoActionIssue(action, ['.6', '.763']);
+    });
+
+    test('for floats starting with number sign followed by a dot', () => {
+      expectNoActionIssue(action, ['-.2', '-.922', '+.5', '+.452']);
+    });
+
+    test('for numbers with leading 0s', () => {
+      expectNoActionIssue(action, ['000', '000123', '000.123', '00012.3']);
     });
   });
 
@@ -108,26 +120,18 @@ describe('decimal', () => {
       expectActionIssue(action, baseIssue, [' 1', '1 ', ' 1 ', '1 2']);
     });
 
-    test('for number seperators', () => {
+    test('for invalid seperators', () => {
       expectActionIssue(action, baseIssue, ['1,000', '1_000', '1 000']);
     });
 
-    test('for exponential numbers', () => {
+    test('for scientific notation', () => {
       expectActionIssue(action, baseIssue, ['1e3', '1e-3', '1e+3']);
     });
 
     test('for floats ending with a dot', () => {
       expectActionIssue(action, baseIssue, ['1.', '342.']);
     });
 
-    test('for floats starting with a dot', () => {
-      expectActionIssue(action, baseIssue, ['.6', '.763']);
-    });
-
-    test('for floats starting with number sign followed by a dot', () => {
-      expectActionIssue(action, baseIssue, ['-.2', '-.922', '+.5', '+.452']);
-    });
-
     test('for floats with multiple dots', () => {
       expectActionIssue(action, baseIssue, [
         '1.2.3',

library/src/regex.ts

@@ -17,7 +17,8 @@ export const CUID2_REGEX: RegExp = /^[a-z][\da-z]*$/u;
 /**
  * [Decimal](https://en.wikipedia.org/wiki/Decimal) regex.
  */
-export const DECIMAL_REGEX: RegExp = /^[+-]?\d+(?:\.\d+)?$/u;
+// eslint-disable-next-line redos-detector/no-unsafe-regex -- false positive
+export const DECIMAL_REGEX: RegExp = /^[+-]?(?:\d*\.)?\d+$/u;
 
 /**
  * [Digits](https://en.wikipedia.org/wiki/Numerical_digit) regex.