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if ('foo 123 bar' =~ /(\d+)/) {
    print("$1\n");
}

123

for (1..2) {
   if ('ab' =~ /a/g) {
...
       print("no match\n");
   }
}

match
no match

for (1..2) {
   if ('ab' =~ /a/) {
...
       print("no match\n");
   }
}

match
match