make the pattern a string in all-versions so it can be serialized, and regex-ify it during implementation

lib/all-versions.js

@@ -49,8 +49,8 @@ const plans = [
     hasNumberedReleases: false,
     openApiBaseName: 'github.ae',
     miscBaseName: 'ghae',
-    allowedFrontmatterPattern: /^issue-\d+?(-and-\d+?)?|next$/,
-    allowedInlinePattern: /^ghae-(issue-\d+?(-and-\d+?)?|next)$/,
+    allowedFrontmatterPattern: '^issue-\\d+?(-and-\\d+?)?|next$',
+    allowedInlinePattern: '^ghae-(issue-\\d+?(-and-\\d+?)?|next)$',
   },
 ]
 

lib/frontmatter.js

@@ -265,9 +265,7 @@ function getValidProps(versionObj) {
 
   // If a version has an exception pattern, both '*' and the exception pattern are valid.
   if (versionObj.allowedFrontmatterPattern) {
-    valid.pattern = new RegExp(
-      `${asteriskPattern.source}|${versionObj.allowedFrontmatterPattern.source}`
-    )
+    valid.pattern = new RegExp(`${asteriskPattern.source}|${versionObj.allowedFrontmatterPattern}`)
     valid.message = `Must have a value of '*' or ${versionObj.allowedFrontmatterPattern}`
   }
 

tests/linting/lint-versioning.js

@@ -105,7 +105,7 @@ describe('lint Liquid versioning', () => {
 function validateVersion(version) {
   const isSupported = allowedVersionNames.includes(version)
   const isException = Object.values(allVersions).some(
-    (v) => v.allowedInlinePattern && v.allowedInlinePattern.test(version)
+    (v) => v.allowedInlinePattern && new RegExp(v.allowedInlinePattern).test(version)
   )
   const isValid = isSupported || isException