RegEx for Horizontal Whitespace (\s \h \t blank etc)

[JMichaelTX]

@Tom

So, to cover also those characters, there are (at least) two good replacements for \h that should work also with programs/languages that are not (yet) supporting \h :

[[:blank:]]

That is the POSIX expression for \h.

@Tom, the saga continues.

I have 3+ sources that all state that [[:blank:]] is the same as [ \t]:

2017-10-13 16:33 CT

So, unfortunately, it is NOT a replacement for \h.

See:

• Regex Tutorial - POSIX Bracket Expressions
• Regular Expressions/POSIX Basic Regular Expressions - Wikibooks
• Regular Expressions Cheat Sheet
• GNU Grep 3.0: Character Classes and Bracket Expressions

[[:blank:]] is NOT mentioned in Regular Expressions - ICU User Guide

<img src="/uploads/default/original/2X/9/9fa034801953dfe7d1745afcb7087c7530a06e23.gif" width="70" height="17"  alt="updated" title="updated"> 2017-10-13 16:47 CT

OK, this is about as authoritative as I can find:

[perlrecharclass - perldoc.perl.org](http://perldoc.perl.org/perlrecharclass.html#POSIX-Character-Classes)

<img src="/uploads/default/original/2X/3/332244b2b9baad79ac8710d25139d0241ec45114.png" width="690" height="111">