Fex ( Filter Expression )

Examples

• 'title':'the right Way'

  • a key term of exactly /^title$/i
  • a value term of exactly /^the right way$/i

• title:'the right way', text:go

  • a key term of contains i.e. /title/i
  • a value term of exactly /^the right way$/i
  • intersected with
  • any value that contains /go/i

• ..title:the right way

  • a key term that ends with /title$/i
  • a value term that contains the before it contains right before it contains way i.e. /the.*right.*way/i

• title:right, title:way

  • a key term that contains /title/i
  • a value term that contains /right/i or /way/i

• title:a..

  • a key term that contains /title/i
  • a value term that starts with /^a/i

• title:..a

  • a key term that contains /title/i
  • a value term that ends with /a$/i

• ref title:..a

  • a key term that contains ref before title i.e. /ref.*title/i
  • a value term that ends with /a$/i

• 'the right way'

  • any value that contains /the right way/i

• the right way

  • any value that contains the before it contains right before it contains way i.e. /the.*right.*way/i

Lexicon

Term:: TBD Key Term:: TBD Value Term:: TBD

Inspiration

• https://support.google.com/mail/answer/7190?hl=en
• https://lucene.apache.org/core/3_1_0/queryparsersyntax.html