Hello, tybalt89, Thank you so much for your great help! My file is very big. How can I use your code? Thank you so much!

#!/usr/bin/perl 

# https://perlmonks.org/?node_id=1220510 

open(IN1, "tmp01") || die "Cannot open this file"; 
@lines = <IN1>; 

use strict; 
use warnings; 

while( <IN1> ) 
  { 
  s/(^| \K)(?!\d)/0/g; 
  print; 
  }
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2018-08-19 Athanasius restored content

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In reply to Re^2: substitute space to 0 by yueli711
in thread substitute space to 0 by yueli711

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