Inspect birthday- and birthmonth-component of a string

Checks whether a given string contains exactly one four-digit number representing a valid combination of a day (birthday) and a month (birth month). Numeric components can be interpreted in either "DDMM" (day-month) or "MMDD" (month-day) format, depending on the specified format. The string is assumed to be a code (e.g., a SGIC), which may include letters and digits.

Usage

inspect_birthdaymonth(code, format = "DDMM")

Arguments

code

A character string containing a SGIC or similar code that may include a numeric component representing a birthday and birth month.

format

A string specifying the format of the date of birth components in code. Use "DDMM" for day-month format and "MMDD" for month-day format. Default is "DDMM".

Value

A logical value: `TRUE` if the string contains exactly one valid numeric component that forms a valid birthday (day and month), otherwise `FALSE`.

Examples

inspect_birthdaymonth("DEF2802") # TRUE - 28th of February is a valid date
#> [1] TRUE
inspect_birthdaymonth("GHI3002") # FALSE - 30th of February is invalid
#> [1] FALSE
inspect_birthdaymonth("XYZ3112") # TRUE - 31st of December is valid
#> [1] TRUE
inspect_birthdaymonth("18DEF02") # FALSE - Multiple numeric components
#> [1] FALSE
inspect_birthdaymonth("XYZ") # FALSE - No numeric components
#> [1] FALSE
inspect_birthdaymonth("ABC1231", format = "MMDD") # TRUE - December 31st is valid
#> [1] TRUE