private/Test-FrequencyString.ps1
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Function Test-FrequencyString { <# .SYNOPSIS Tests a natural language text input for time intervals .DESCRIPTION Tests a natural language text input for time intervals. This returns a regex match object with the results, $false boolean value .PARAMETER Frequency Natural language text of the interval to test .EXAMPLE Test-FrequencyString -Frequency 'Every first wednesay of the month' .EXAMPLE Test-FrequencyString -Frequency 'Every 31st of the month repeated every 3 months' .EXAMPLE Test-FrequencyString -Frequency 'Every 3rd of the month repeat every 2 months' .NOTES For additional information please see my GitHub wiki page .FUNCTIONALITY None .LINK https://github.com/My-Random-Thoughts/Rapid7Nexpose #> [CmdletBinding()] Param ( [string]$Frequency ) # Define the interval regex [System.Text.StringBuilder]$regexString = '' # Capture groups used in 'Convert-IntervalString' [void]($regexString.Append('^(?:once|every (?:(?:(?:1 )?(hour|day|week)|([2-9]|[1-9][0-9][0-9]?) (hours|days|weeks))|')) # Capture groups 1, 2 and 3 [void]($regexString.Append('(monday|tuesday|wednesday|thursday|friday|saturday|sunday)|')) # Capture group 4 [void]($regexString.Append('(?:(1st|2nd|3rd|4th|5th) (monday|tuesday|wednesday|thursday|friday|saturday|sunday)|')) # Capture groups 5 and 6 [void]($regexString.Append('((?:[23]?(?<!1)1st|2?(?<!1)2nd|2?(?<!1)3rd)|(?:(?:[4-9]|[1-2][04-9])|11|12|13|30)th))')) # Capture group 7 [void]($regexString.Append('(?: of the month(?: repeat(?:ed)? every ([2-9]|[1-9][0-9][0-9]?) months)?)))$')) # Capture group 8 Write-Verbose -Message $regexString # Validate input string Return ([regex]::Match($Frequency.ToLower(), $regexString.ToString(), 'IgnoreCase')) } |