WordsLength←{
⍝ Short and sweet
     WL←{≢∊1↓¯1↓'., '((~∊⍨)⊆⊢)⍵} 
⍝ More performant on long input strings
     WL2←',. '∘{≢⍺~⍨⍵{(-⊃⌽⍵)↓(⊃⍵)↓⍺}⊃⍤⍸⍤1⊢(⊢,[0.5]⌽)⍺∊⍨⍵}
⍝ Regex
     WL3←{≢⍤('^\w+' '\w+$' '\W'⎕R'')⍵} 
     WL2 ⍵
 }