[SOLVED] Extracting a value from a string using sed

Issue

I have the following code:

set MARKER_LIST = "t14_noTap_leftSlow t24_noTap_leftMedium t34_noTap_leftFast \
 t44_noTap_rightSlow t54_noTap_rightMedium t64_noTap_rightFast \
 t74_noTap_inphaseSlow t84_noTap_inphaseMedium t94_noTap_inphaseFast \
 t104_noTap_antiphaseSlow t114_noTap_antiphaseMedium t124_noTap_antiphaseFast"

foreach code (${MARKER_LIST})

set evt_code = `echo ${code} | sed 's/^.*t[0-9]*_noTap_//'`
echo "Extracted value: $evt_code"
end

I'm trying to extract the string after "tXX_noTap_" and "tXXX_noTap_" but it doesn't seem to be working. Would appreciate any help with this. Thanks!

Solution

Your problem is that you do not declare tcsh as the shell to interpret the script. So sh-aware code is expected. Start your script with the correct shebang in the first line:

#!/usr/bin/tcsh

---

Just beyond your question:

1. Your sed code itself is fine, but perhaps unnecessary complicated:

   sed 's/^.*_//' 
   

   should be enough, except you expect output with _ in the desired part of the string.

2. Please eliminate all the \ with their line breaks in ${MARKER_LIST}. Else the result will contain empty values at each appearance of \:

   Extracted value: leftSlow
   Extracted value: leftMedium
   Extracted value: leftFast
   Extracted value: 
   Extracted value: rightSlow
   Extracted value: rightMedium
   Extracted value: rightFast
   Extracted value: 
   Extracted value: inphaseSlow
   Extracted value: inphaseMedium
   Extracted value: inphaseFast
   Extracted value: 
   Extracted value: antiphaseSlow
   Extracted value: antiphaseMedium
   Extracted value: antiphaseFast
   

So this would be your script:

#!/usr/bin/tcsh

set MARKER_LIST = "t14_noTap_leftSlow t24_noTap_leftMedium t34_noTap_leftFast t44_noTap_rightSlow   t54_noTap_rightMedium t64_noTap_rightFast t74_noTap_inphaseSlow t84_noTap_inphaseMedium t94_noTap_inphaseFast t104_noTap_antiphaseSlow t114_noTap_antiphaseMedium t124_noTap_antiphaseFast"

foreach code (${MARKER_LIST})
    set evt_code = `echo ${code} | sed 's/^.*t[0-9]*_noTap_//'`
    echo "Extracted value: $evt_code"
end

Answered By - dodrg

Answer Checked By - Pedro (WPSolving Volunteer)