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  1. #!/bin/bash
  2. s='abc.class1 def.class2 ghi.class1.class2 .class1.class2 
  3. abc.class3 def.class4 ghi.class3.class4 .class3.class4'
  4. sed -E 's/( |^)[^ .]+\./\1./g'  <<< "$s"
Success #stdin #stdout 0.01s 5520KB
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Standard input is empty
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.class1 .class2 .class1.class2 .class1.class2 
.class3 .class4 .class3.class4 .class3.class4
https://ideone.com/ynDKLu
language:
Bash (bash 5.0.3)
created:
2 years ago
visibility:
secret

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