[functional-parameters] ignorePattern isn't matching against reduce function callbacks

[garethallenstringer]

Having difficulty matching ignorePattern to a .reduce() function for the case of:

"functional/functional-parameters": ["warn", { "enforceParameterCount": "exactlyOne", "ignorePattern": ["(?<=\\.reduce\\()(.*)(?=\\))"] }]

in my eslintrc.json rules. I have tried a multitude of other regular expressions but haven't had any joy.

[RebeccaStevens]

Unfortunately, regex patterns have there limit.

The proposal in #244 should allow for a nicer way to solve this issue.