Add Regex validation of schedule

template.yaml

@@ -56,6 +56,8 @@ Parameters:
     Type: String
     Description: Schedule for trigger the execution of ssosync (see CloudWatch schedule expressions)
     Default: rate(15 minutes)
+    AllowedPattern: '^rate\((?:1\s(?:hour|minute|day)|(?:[2-9]|[1-9][0-9]+)\s(?:hours|minutes|days))\)|cron\(\s*(?:\*|(?<minutes>0|[1-5]{0,1}[0-9]?)(?:(?:,(?P>minutes))*|(?:-(?P>minutes)){0,1}(?:\/[[:digit:]]){0,1}))\s\s*(?:\*|(?<hours>0|[1]{0,1}[0-9]?|2[0-3])(?:(?:,(?P>hours))*|(?:-(?P>hours)){0,1}(?:\/[[:digit:]]){0,1}))\s\s*(?:(?<qDays>\?)|\*(?<days>[1-2]{0,1}[1-9]?|31|10|20|30)(?:(?:,(?P>days))*|(?:-(?P>days)){0,1}(?:\/[[:digit:]]){0,1}|L|W))\s\s*(?:\*|(?<month>[1-9]|1[0-2])(?:(?:,(?P>month))*|(?:-(?P>month)){0,1}(?:\/[[:digit:]]){0,1})|(?<alphamonth>JAN|FEB|MAR|APR|MAY|JUN|JUL|AUG|SEP|OCT|NOV|DEC)(?:(?:,(?P>alphamonth))*|(?:-(?P>alphamonth)){0,1}(?:\/[[:digit:]]){0,1}))\s\s*(?(<qDays>)(?:\*|(?<week>[1-7])(?:(?:,(?P>week))*|(?:-(?P>week)){0,1}(?:\/[[:digit:]]){0,1}|L|#[1-5])|(?<alphaweek>MON|TUE|WED|THU|FRI|SAT|SUN)(?:(?:,(?P>alphaweek))*|(?:-(?P>alphaweek)){0,1}(?:\/[[:digit:]]){0,1}))|\?)\s\s*(?:\*|(?<year>19[7-9][0-9]|2[0-1][0-9][0-9])(?:(?:,(?P>year))*|(?:-(?P>year)){0,1}(?:\/[[:digit:]]){0,1}))\s*\)$
+h'
   LogLevel:
     Type: String
     Description: Log level for Lambda function logging