Handle **ingredient**

[wvengen]

Sometimes ingredients are surrounded by double asterisks, this is probably marking of an allergen (see also #4). The strict parser doesn't currently handle this (or recognizes it as the start of notes), and the loose parser recognizes the first ** as mark and includes the second ** in the resulting name.

This happens in 0.15% of the ingredient lists.

[wvengen]

For examples, run grep '\*\*\w[^,;.:()]*\w\*\*' data/ingredient-samples-nl.

[wvengen]

It would be a good idea to add allergen-detection with this (#4).

[wvengen]

I've only observed it around a word, or mid-word, e.g.

• **melk**
• **melkeiwitpoeder**
• **mosterd**-dille
• **soja**saus
• **schapen**- en **geitenmelk**

[wvengen]

One idea would be to strip such occurences, and add the text within the double asterisks as allergens of the ingredient.
Though **schapen**- en **geitenmelk** is actually ambivalent: does it contain sheep and goat-milk, or does it contain sheep-milk and goat-milk? (I guess the latter, but this can only be known by taking into account domain knowledge and context, so not something for a parser.)