# Example Scripts

Eduction includes the following example post-processing scripts.

## Checksum Validation

The `checksum_luhn.lua` script verifies the checksum digit of each match using the Luhn algorithm, and reduces the score associated with the match if the checksum is wrong. The `checksum_luhn_enmasse.lua` script performs checksum validation as an en masse processing task, discards incorrect matches, and alters the score of correct matches to equal the proportion of matches that have the correct checksum digit.

You can use these scripts with the `number_cc.ecr` and `number_sin_ca.ecr` grammar files to validate most credit card numbers.

## Spanish Identity Card Number Validation

You can use the `checksum_dni_es.lua` script with the `number_dni_es.ecr` grammar file to validate Spanish Documento Nacional de Identidad (national identity card) numbers.

## Dutch Citizen Service Number Validation

You can use the `checksum_bsn_nl.lua` script with the `number_bsn_nl.ecr` grammar file to validate Dutch Citizen Service Numbers (Burgerservicenummer, or BSNs).

## Geographical Coordinate Standardization

You can use the `lat_long.lua` script with the `place_lat_long.ecr` grammar file to convert and standardize the output of geographical coordinates.

## Date and Time Standardization

You can use the `datetime.lua` script with the `datetime_advanced_eng.ecr` grammar file to convert and standardize the output of dates and times (and ranges) in English into a standardized format in cases where there are matches on several formats. For example, you can convert both 23/11/13 and Nov 23 2013 to 2013-11-23.

The `datetime_advanced_eng.ecr` grammar file can understand English natural language dates, and relative dates such as last Saturday morning. You can provide a reference date for `<today>` in the Lua script to enable normalization of relative dates into standard formats.

For date and time range matches, this script sets the normalized text to `<start>/<end>`, and additionally adds `STARTPOINT` and `ENDPOINT` components that contain the associated dates or times. When there is a multiple date match (for example, 5th and 8th July matches as 5th July and 8th July), the script returns a comma-separated list, with a POINT component for each date.

## Filter Matches by Case

You can use the `case_filter.lua` example script to filter out matches by case, for example in personal name grammars.

To use this option, you must set `MatchCase` to `False` for the grammar. The script filters out any match that is not one of:

- an exact match as specified in the grammar.
- an upper case match (for example, JANE SMITH).
- a title case match (for example Jane Smith).

NOTE: You might need to update this script to include case mappings for uncommon non-ASCII characters. The script provides sample mappings for common Latin characters with diacritics.

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