Date Format Validation in Javascript with Regular Expressions: Focusing on DD/MM/YYYY

Matching dates in a specific format is crucial for data validation in javascript. While a regex exists for the YYYY-MM-DD format, the need arises for a pattern to validate dates in DD/MM/YYYY format, with a focus on Spanish usage and the exclusion of slashes or dashes as separators.

To address this requirement, a regex that flips the order of the day, month, and year components can be employed:

/^(0?[1-9]|12|3[01])[/-](0?[1-9]|1[012])[/-]\d{4}$/

This revised regex allows for the validation of dates in either DD/MM/YYYY or DD-MM-YYYY format. It restricts the separators to periods (.) and hyphens (-) while preventing the use of slashes (/).

To implement this regex in a javascript validation context, the following adjustments can be made:

[...]
"date": {
    "regex": /^(0?[1-9]|[12][0-9]|3[01])[\/\-](0?[1-9]|1[012])[\/\-]\d{4}$/,
    "alertText": "Alert text DD/MM/YYYY"
},
"other type..."[...]

With this modified regex, dates in the DD/MM/YYYY format can be validated, ensuring the correct format for Spanish usage and excluding invalid dates such as 31/02/4899.