Multiple spaces in a regular expression can make it hard to tell how many spaces should be matched. It’s more readable to use only one space and
then indicate with a quantifier how many spaces are expected.
Noncompliant code example
Pattern.compile("hello world");
Compliant solution
Pattern.compile("hello {3}world");
Exceptions
In free-spacing mode (Pattern.COMMENTS flag, or with embedded flag
expression (?x)), whitespaces are ignored. In this case no issue should be triggered, because the whitespaces may be intended to improve
readability.
