Python re.search vs re.sub Post: 302965355

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Top Forums Programming Python re.search vs re.sub Post 302965355 by metallica1973 on Wednesday 27th of January 2016 05:58:34 PM

01-27-2016

Registered User

Python re.search vs re.sub

I am having trouble understanding why these two commands differ with one producing the desire results and the other not. An example:

Code:

capture_str = 'xserver-xorg-video-qxl-dbg (0.1.1-2+b2 [s390x], 0.1.1-2+b1 [amd64, armel, armhf, i386, mips, mipsel, powerpc], 0.1.1-2 [arm64, ppc64el]) X.Org X server -- QXL display driver (debugging symbols)'

re.search(r'(?<=\[s390x\]\, ).*', capture_str).group(0)
'0.1.1-2+b1 [amd64, armel, armhf, i386, mips, mipsel, powerpc], 0.1.1-2 [arm64, ppc64el]) X.Org X server -- QXL display driver (debugging symbols)'

re.sub(r'(?<=\[s390x\]\, ).*', '', capture_str)
'xserver-xorg-video-qxl-dbg (0.1.1-2+b2 [s390x], '

I am truly confused at why "re.sub" doesnt perform a positive lookbehind that re.search can do. It appears to be doing the opposite with the same regex. What is the difference?

Last edited by metallica1973; 01-27-2016 at 07:11 PM..

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ttk::frame

ttk::frame(n)							 Tk Themed Widget						     ttk::frame(n)

__________________________________________________________________________________________________________________________________________________

NAME

       ttk::frame - Simple container widget

SYNOPSIS

       ttk::frame pathName ?options?
_________________________________________________________________

DESCRIPTION

       A ttk::frame widget is a container, used to group other widgets together.

STANDARD OPTIONS

       -class		     -cursor		  -takefocus
       -style

       See the ttk_widget manual entry for details on the standard options.

WIDGET-SPECIFIC OPTIONS
       [-borderwidth borderWidth]  The desired width of the widget border.  Defaults to 0.  [-relief relief] One of the standard Tk border styles:
       flat, groove, raised, ridge, solid, or sunken.  Defaults to flat.  [-padding padding] Additional padding  to  include  inside  the  border.
       [-width width]  If specified, the widget's requested width in pixels.  [-height height] If specified, the widget's requested height in pix-
       els.

WIDGET COMMAND

       Supports the standard widget commands configure, cget, identify, instate, and state; see ttk::widget(n).

NOTES

       Note that if the pack, grid, or other geometry managers are used to manage the children of the frame, by the GM's requested size will  nor-
       mally take precedence over the frame widget's -width and -height options.  pack propagate and grid propagate can be used to change this.

SEE ALSO

       ttk::widget(n), ttk::labelframe(n), frame(n)

KEYWORDS

       widget, frame, container

Tk									8.5							     ttk::frame(n)