$ans = eval "\$str =~ tr/$SrchStr/$SrchStr/";
die $@ if $@;

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Update: If you want to count slashes, define $SrchString as '\/', or use a separator other than / for tr. Thanks to Corion for reminding me to point this out.

the lowliest monk

In reply to Re: Capturing occurrence counts via tr/// with variable interpolation by tlm
in thread Capturing occurrence counts via tr/// with variable interpolation by KenW

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