BASH Regex

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Top Forums Shell Programming and Scripting BASH Regex - get filename tags, labels and descriptions Post 303024953 by Bishop on Sunday 21st of October 2018 12:59:27 AM

10-21-2018

Registered User

Ok, I think I got this thing working now.
I did not know how to extract content A,B,C from "only" end brackets so I had to create new VAR from the tail brackets (if existed) and then extract contents of A,B and C from that. Otherwise regex would be getting 1,2,3 from brackets in the filename.

Anyway... it is ok as it is now but if there is a better solution I would love to learn it.
note: this is for string testing only, once it is in a real script I would have checking to see if file or directory before getting shortName and extension.

Code:

#!/bin/bash
test_str=(
    'test1.{1}(2)[3] dots.spaces {A1}(B1)[C1].ext'
    'test2.[3]{1}(2) dots.spaces [C1](B1){A1}.ext'
    'test3 [3].com [C1].ext'
    'test4 {1}(2)[3]dots.ext'
    'test4 {1} (2) [3] dots.ext'
    'test6 (B1)[C1].ext'
    'test7[C1](B1).ext'
)
IFS='
'
regexp='\s*(\([^)]+\)|\{[^}]+\}|\[[^][]+\])+$'
subst=""
regexTag='.*\[([^]]+)\]'
regexLab='.*\{([^}]+)\}'
regexDes='.*\(([^)]+)\)'


for p in "${test_str[@]}"
do
    NameNoExt=`echo "${p%.*}"`
    if [[ $NameNoExt =~ $regexp ]]; then
        tailBrackets="${BASH_REMATCH[0]}";
        shortName=$(echo "$NameNoExt" | sed -r 's/'$regexp'/'$subst'/g');
    else
        shortName="$NameNoExt"
        tailBrackets=""
    fi
    # if tail bracket exist then extract A,B,C
    if [ $tailBrackets ]; then
        if [[ $tailBrackets =~ $regexTag ]]
        then 
          TAG="${BASH_REMATCH[1]}"
        else 
          TAG=""
        fi
        if [[ $tailBrackets =~ $regexLab ]]
        then 
          LAB="${BASH_REMATCH[1]}"
        else 
          LAB=""
        fi
        if [[ $tailBrackets =~ $regexDes ]]
        then 
          DES="${BASH_REMATCH[1]}"
        else 
          DES=""
        fi
    else
        TAG=""
        LAB=""
        DES=""
    fi
    zenity --info --text "`printf "Filename = \"$p\"\n\nNameNoExt = \"$NameNoExt\"\nShort Name  = \"$shortName\"\nTail Brackets = \"$tailBrackets\"\nA  = \"$LAB\"\nB  = \"$DES\"\nC  = \"$TAG\""`"
done

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gst-launch-ext

gst-launch-ext-0.8(1)						   User Commands					     gst-launch-ext-0.8(1)

NAME

       gst-launch-ext-0.8, gst-launch-ext - run a predefined GStreamer pipeline

SYNOPSIS

       gst-launch-ext-0.8 filename [filename...] [gst-std-options]

       gst-launch-ext filename [filename...] [gst-std-options]

DESCRIPTION

       gst-launch-ext-0.8  runs  a  basic predefined GStreamer pipeline, and prints the name of the pipeline. gst-launch-ext-0.8 is only used as a
       quick test to ensure that codecs and GStreamer work properly. gst-launch-ext-0.8 does not handle more advanced features	such  as  synchro-
       nization.

OPTIONS

       The following options are supported by gst-launch-ext-0.8 and gst-launch-ext:

       gst-std-options		       Standard  options  available  for  use  with  most GStreamer applications.  See gst-std-options(5) for more
				       information.

       The following options are supported by gst-launch-ext only:

       --gst-list-mm   List found major/minor versions. This option displays the versions that are available.

       --gst-mm=string Force major/minor version. This option enables you to specify a specific version to run, if you do  not	want  to  run  the
		       default version.

       --print	       Print wrapped command line. This option displays the command that will be run, and then runs the command.

OPERANDS

       The following operands are supported:

       filename        The name of the GStreamer pipeline to run.

EXTENDED DESCRIPTION

       gst-launch-ext-0.8  can	be  configured by creating a .gst file in your home directory. This PERL-style configuration file can override the
       default values for audio and video output sinks.

       The following example .gst file implements the same defaults as those hard-coded in the script:

       AUDIOSINK = osssink
       VIDEOSINK = ffmpegcolorspace ! xvimagesink

       You can change osssink to esdsink, alsasink, or sunaudiosink, and you can change xvimagesink to ximagesink, aasink,  or	sdlvideosink.  You
       must have the appropriate plugin installed on the system to use the specified output sink. Other GStreamer plug-ins can also be used.

EXAMPLES

       Example 1: Launching a GStreamer Pipeline

       example% gst-launch-ext-0.8 filename

EXIT STATUS

       The following exit values are returned:

       0	Application exited successfully

       >0	Application exited with failure

FILES

       The following files are used by this application:

       /usr/bin/gst-launch-ext-Executable to run a predefined GStreamer pipeline

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWgnome-media		   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |External			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       Latest version of the GNOME Desktop User Guide for your platform.

       gst-complete(1),  gst-compprep(1),  gst-feedback(1),  gst-inspect(1), gst-launch(1), gst-md5sum(1), gst-register(1), gst-thumbnail(1), gst-
       typefind(1), gst-xmlinspect(1), gst-xmllaunch(1), gstreamer-properties(1), libgstreamer-0.8(3), libgstgetbits(3), gst-std-options(5)

NOTES

       Written by Brian Cameron, Sun Microsystems Inc., 2004.

SunOS 5.10							    14 Oct 2004 					     gst-launch-ext-0.8(1)

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