Monks, Today my colleague asked me to just replace the entities ~~~ with ~~~ in a small file. Both side of the entities, alphabets or digits or underscore ll be there. So i just wrote a small script but i found strange behaviour.

So i tried with small string sample and found the same answer as shown below:

First tested:
-------------
$str = 'abac 123 afa123f';
$str =~ s|\B123\B|***|g;
print $str;
output i got as i expected:
---------------------------
abac 123 afa***f


Second tested:
--------------
$str = 'abac ~~~ afa~~&#x0007E
+;f';
$str =~ s|\B\&\#x0007E\;\&\#x0007E\;\&\#x0007E\;\B|~~~|g;
print $str;
output i got:
-------------
abac ~~~ afa~~~f
expected output:
----------------
abac ~~~ afa~~~f

[download]

For clarification i went through the documentation as well, it says what i expected. Why this strange behaviour. Where am i going wrong?

Prasad

In reply to Word boundary '\B' - Question by prasadbabu

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