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  1. #!/bin/bash
  2. s="free energy    TOTEN  =       -96.86706464 eV";
  3. E=$(grep -oP 'free energy.* \K-?[0-9][0-9.]*' <<< "$s")
  4. echo "$E";
Success #stdin #stdout 0s 4416KB
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-96.86706464
https://ideone.com/lZAakx
language:
Bash (bash 5.0.3)
created:
4 years ago
visibility:
public

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