strip trailing whitespace from multi-line string

[iCode 8]

i'm trying to strip any trailing space from every line of a multiline string without splitting the string using something like StringRegExpReplace($string, '(?m)\h+$', '')

sample string...

a [followed by a space]

b [followed by a space]

so it seems like any of these expressions should work, but only the last space is matched...

(?m)\h+$
(?m:\h+$)
(?m:\h+)$
(?m)\h+\z
(?m:\h+\z)
(?m:\h+)\z

so \h doesn't seem like it's working in multiline mode, yet this does...

(?m)\s+$

from the help file...

$ assert end of string (or line, in multiline mode)

and...

The settings of the PCRE_CASELESS, PCRE_MULTILINE, PCRE_DOTALL, and PCRE_EXTENDED options can be changed from within the pattern by a sequence of Perl option letters enclosed between "(?" and ")". The option letters are

m for PCRE_MULTILINE

[Ramzes 0]

I think this is the easiest way:

#include <Array.au3>
$String = "Red   " & @CRLF & "Blue " & @CRLF & "Green     "
$String = StringSplit($String, @CRLF, 3)
For $i = 0 To UBound($String) - 1
$String[$i] = StringStripWS($String[$i], 2)
Next
$String = _ArrayToString($String, @CRLF)
MsgBox(32, "", "|" & $String & "|")

[JohnOne 1,591]

StringStripWS ( "string ", 2)

[jchd 1,045]

StringRegExpReplace($s, '\h*\r', '')

[Melba23 2,863]

iCode,

Try this:

StringRegExpReplace($sString, "\h*(?=\v|\z)", "")

\h*      - any number of horizontal whitespace characters
(?=\v|\z) - which are followed by either a vertical whitespce or an end of string.

That seems to work even if there are multiple spaces at the end of the lines or additional spaces within them.

M23

[iCode 8]

i should have specified that i don't want to strip vertical spaces, so none of the above will work, except...

@Melba23 - ?= positive look ahead is a weak point for me - i changed yours a bit (* to +) and this seems to doing what i want...

\h+(?=\v|\z)

thanks for that!

so this is is pretty close to what i wanted to build - matches string beginning space(s), string ending space(s) and beginning and ending horiz space(s) for each line...

(?m:^\h+)|\h+(?=\v|\z)

would be cool i think to have 2 options added to StringStripWS()

* strip all horizontal space for beginning of every line

* strip all horizontal space for end of every line

actually this works even better...

^\s+|(?m:^\h+)|\h+(?=\v|\z)|\s+$

Edited October 2, 2011 by iCode

[Melba23 2,863]

iCode,

You can do that with a simple wrapper function as Ramzes showed above so I doubt your suggestion woudl meet with much success.

From the Feature Request Guidelines:

Think about your feature request. If you can do it via UDFs, then don't ask for it to be built in. There's a reason you can create your own functions.

M23