15 digits for integer real number: 18 digits for before-dot part (*what it's called?)

A regex I use to Tokenize Hashtags in common textflow

Add single quotes to unquoted parts of a valid JS hash so it can be parsed with JSON decoders. Tries to keep boolean and numeric values unquoted Note: It will not handle certain edge-cases You might need to clear the trailing commas

This will allow for valid string parsing via a regex in popular interpreted languages like Lua, Python and Ruby.

Validate dates in the formats of 1Feb20/01Feb20/29FEB20 with the 29th of February invalid on non-leap years.

Sourced from https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/488478/Bulk_Data_Transfer_-_additional_validation_valid_from_12_November_2015.pdf and modified to allows spaces to be optional

Validate dates in the format of 20201231 with leap year check on the 29th of February

Format of 29Feb2020 or 29FEB2020 with leap year check