CoreData Predicate get every sentence that contains any word in array

Question

In Swift 4 I have a CoreData \"Sentence\" model that has a String attribute \"englishsentence\". I also have an array of \"words\" and would like to fetch all sentences for

Answer 1

One option would be to create a “compound predicate:”

let words = ["today", "yesterday", "tomorrow"]

let predicates = words.map {
    NSPredicate(format: "englishsentence CONTAINS %@", $0)
}
let predicate = NSCompoundPredicate(orPredicateWithSubpredicates: predicates)

Another option is to match against a regular expression:

let regex = ".*(" + words.map {
    NSRegularExpression.escapedPattern(for: $0)
}.joined(separator: "|") + ").*"

let predicate = NSPredicate(format: "englishsentence MATCHES %@", regex)

To match only “whole words” you can add the word boundary pattern \b:

let regex = ".*\\b(" + words.map {
    NSRegularExpression.escapedPattern(for: $0)
}.joined(separator: "|") + ")\\b.*"