Regular Expression Perl

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  4. The s Operator and Substitution
The s operator is for substitutions. 
The g stands for global change on a line. 
Format
s/old/new/;
s/old/new/i;
s/old/new/g;
s+old+new+g;
s(old)/new/;   s[old]{new};
s/old/expression to be evaluated/e;
s/old/new/ige;
s/old/new/x;