lettersPattern

Use lettersPattern to extract words from a string containing letters, numbers, white spaces, and punctuation.

Create txt as a string. Create pat as a pattern object that matches letters using lettersPattern. Extract the pattern from txt.

txt = "The 2 parties agreed. The meeting would occur at 1 PM.";
pat = lettersPattern;
words = extract(txt,pat)

words = 9x1 string
    "The"
    "parties"
    "agreed"
    "The"
    "meeting"
    "would"
    "occur"
    "at"
    "PM"

Use lettersPattern to count the occurrences of individual letters in a line of text.

Create txt as a string. Create pat as a pattern object that matches individual letters using lettersPattern. Extract the pattern. Display a histogram of the number of occurrences of each letter.

txt = "What are the letters in this sentence?";
pat = lettersPattern(1);
letters = extract(txt,pat);
letters = categorical(letters);
histogram(letters)

Use lettersPattern to exclude words with more than five letters.

Create pat as a pattern that matches groups of five or more letters using lettersPattern. Extract the pattern.

txt = "Some of these words are longer than others.";
pat = lettersPattern(5,inf);
extract(txt,pat)

ans = 4x1 string
    "these"
    "words"
    "longer"
    "others"