Do a global search for non-word characters in a string:
var patt1 = /\W/g;
The marked text below shows where the expression gets a match:
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Definition and Usage
The \W metacharacter is used to find a non-word character.
A word character is a character from a-z, A-Z, 0-9, including the _ (underscore) character.
The \W metacharacter is supported in all major browsers.
Syntax with modifiers