`isstrprop`

Classifies each character of a text by a property such as alphabetic or digit.

Category: Language Fundamentals > Data Types

Syntax

tf = isstrprop(str, category)

Returns a logical array that is true where the character belongs to category.

Description

isstrprop generalizes isletter and isspace: one call, many character classes. The categories are not mutually exclusive, for example a letter is both 'alpha' and 'alphanum', and a digit is both 'digit' and 'xdigit'.

Indexing the text with the result extracts or removes characters of a kind, such as s(isstrprop(s, 'digit')).

Input arguments

str: Character array.
category: One of 'alpha', 'alphanum', 'digit', 'lower', 'upper', 'punct', 'wspace', 'cntrl', 'graphic', 'print', 'ascii', 'xdigit'.

Output arguments

tf: Logical array the same size as str.

Example

Digits and punctuation

s = 'Ab 1,!';
isstrprop(s, 'alpha')
isstrprop(s, 'punct')
s(isstrprop(s, 'digit'))

Output

ans = 1×6 logical array

   1   1   0   0   0   0
ans = 1×6 logical array

   0   0   0   0   1   1
ans = '1'

isstrprop