Regular Expressions 101

Community Patterns

Quartz CRON Validation with groups

1

Regular Expression
ECMAScript (JavaScript)

/
^\s*($|#|\w+\s*=|(?<SECOND>(?:\?|\*|(?:(?<START_SEC>[0-5]?\d)(?:(?<DELIMITER_SEC>\-|\/|\,)(?<END_SEC>[0-6]?\d))*)))\s+(?<MINUTE>(?:\?|\*|(?:(?<START_MIN>[0-5]?\d)(?:(?<DELIMITER_MIN>\-|\/|\,)(?<END_MIN>[0-6]?\d))*)))\s+(?<HOUR>(?:\?|\*|(?:(?<START_HR>[0-2]?\d)(?:(?<DELIMITER_HR>\-|\/|\,)(?<END_HR>[0-2]?\d))*)))\s+(?<DAYOFMONTH>\?|\*|(?:(?<START_DOM>L|W|LW|[1-3]?\dW?)(?:(?<DELIMITER_DOM>\-|\/|\,)(?<END_DOM>[1-3]?\d?W?))*))\s+(?<MONTH>\*|(?:(?<START_MON>[1-9]|1[012]|JAN|FEB|MAR|APR|MAY|JUN|JUL|AUG|SEP|OCT|NOV|DEC)(?:(?<DELIMITER_MON>\-|\/|\,)(?<END_MON>[1-9]|1[012]|JAN|FEB|MAR|APR|MAY|JUN|JUL|AUG|SEP|OCT|NOV|DEC))*))\s+(?<DAYOFWEEK>\?|\*|(?:(?<START_DOW>[1-7]|SUN|MON|TUE|WED|THU|FRI|SAT)(?:(?:(?:(?<DELIMITER_DOW>\/|\,|\#)(?<END_DOW>[1-7]|SUN|MON|TUE|WED|THU|FRI|SAT))*)L?)*))(?:|\s)+(?<YEAR>(?:\*|(?:(?<START_YR>\b(?:[1-2](?:9|0)\d\d)\b)(?:(?<DELIMITER_YR>\-|\/|\,)(?<END_YR>\b(?:[1-9]|[1-9][0-9]|1[0-8][0-9]|19[0-2])\b|\b(?:[1-2](?:9|0)\d\d)\b))*))))$
/
gm

Description

CRON validation

Validates CRON pattern (Quartz) and supports groups. Useful for e.g. typescript or other typed languages.

The following greoups are covered:

  • second
  • minute
  • hour
  • day of month
  • month
  • day of week
  • year

A group generally consists of START_{GROUP}, DELIMITER_{GROUP} and END_{GROUP} containing the first character of the group, the used delimiter (generally ,,-,/) and the last character.

If a group has a delimiter (typeof DELIMITER_{GROUP} !== "undefined") you can split a complete group into an array by using the groups delimiter on the group string. Example

const cronregex = cronstring.match(regex); //this regex string
const regexgroups = cronregex.groups as RegexGroups; //custom stype
const secondsarray = regexgroups.SECOND.split(regexgroups.DELIMITER_SEC); //every character as array item

More information: https://docs.openinc.dev/docs/opendash-core/overview

Submitted by Nico Vitt - 2 months ago