RFR: 8199594: Add doc describing how (?x) ignores spaces in character classes [v2]

[Ian Graves]

On Wed, 21 Jul 2021 21:30:01 GMT, Lance Andersen <lancea at openjdk.org> wrote:

>> Ian Graves has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   delete errant line
>
> src/java.base/share/classes/java/util/regex/Pattern.java line 758:
> 
>> 756:  *    group just as in Perl.  </p></li>
>> 757:  *
>> 758:  *    <li><p> In Perl, <i>free-spacing mode</i> (which is called <i>comments
> 
> Looks good overall, one suggestion is to perhaps re-phrase the opening of the paragraph as the preceding  paragraph also starts with "In-Perl".

Good idea. Re-worded to "Free-spacing mode in Perl (called comments..."

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PR: https://git.openjdk.java.net/jdk/pull/4618