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

Bishop

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libbash

LIBBASH(7)							  libbash Manual							LIBBASH(7)

NAME

     libbash -- A bash shared libraries package.

DESCRIPTION

     libbash  is  a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may
     want to load and use in scripts of your own.

     It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries.

     Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1).  A bash shared library that can be  loaded
     using
     ldbash(1) must answer 4 requirments:

     1.     It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash).

     2.     It must contain a line that begins with '#EXPORT='.  That line will contain (after the '=') a list of functions that the library
	    exports.  I.e. all the function that will be usable after loading that library will be listed in that line.

     3.     It must contain a line that begins with '#REQUIRE='.  That line will contain (after the '=') a list of bash libraries that are
	    required for our library.  I.e. every bash library that is in use in our bash library must be listed there.

     4.     The library must be listed (For more information, see ldbashconfig(8)).

   Basic guidelines for writing library of your own:
     1.     Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions.

     2.     Try to declare all variables intended for internal use as local.

     3.     Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with:
		  __<library_name>_
	    For example, internal function myfoosort of hashstash library should be named as
		  __hashstash_myfoosort
	    This helps to avoid conflicts in global name space when using libraries that come from different vendors.

     4.     See html manual for full version of this guide.

AUTHORS

     Hai Zaar <haizaar@haizaar.com>
     Gil Ran <ril@ran4.net>

SEE ALSO

     ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1)

Linux								       Epoch								     Linux

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