"&&" and "and" have differing precedences. "and" is lower precedence than "&&". The same goes for "||" and "or"; "or" has lower precedence than "||". "and" actually has lower precedence than "||", as I will demonstrate.

code with "&&": 

perl -e 'if(0&& 0||1){print"hello\n"}'

[download]

output: 

hello

[download]

code with "and": 

perl -e 'if(0and 0||1){print"hello\n"}'

[download]

(outputs nothing)

In reply to Re^4: Perl Parsing Based on Supplied Precedence by protist
in thread Perl Parsing Based on Supplied Precedence by protist

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