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Re^8: How to avoid an alphabet and integer next to it in a string?

by runrig (Abbot)
on Mar 21, 2014 at 19:25 UTC ( [id://1079342]=note: print w/replies, xml ) Need Help??


in reply to Re^7: How to avoid an alphabet and integer next to it in a string?
in thread How to avoid an alphabet and integer next to it in a string?

Think about it. How does that help (read again what output I asked for)? When you're trying to determine input and output to something...just print the something...
my $molform = <STDIN>;
print "Molform before: [$molform]\n";

s/\s+$//, s/H(?![a-z])\d*//g for $molform;
print "Molform after: [$molform]\n";

[download]
Although hazylife may have nailed the problem...you need to learn how to provide useful debugging information.
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Re^9: How to avoid an alphabet and integer next to it in a string?
by piscean (Acolyte) on Mar 21, 2014 at 19:40 UTC
    Using your code, input as C6H9 
    ------Please enter single letter elements in caps only------
Enter the molecular formula of the compound = C6H9Hg
Molform before: [C6H9
]
Molform after: [C6]
The molecular weight of the above compound is = 72.0642

    [download]

    Using your code, input as C6H9Hg 

    ------Please enter single letter elements in caps only------
Enter the molecular formula of the compound = C6H9Hg
Molform before: [C6H9Hg
]
Molform after: [C6Hg]
Molform after: [C6Hg]
The molecular weight of the above compound is = 272.6542

    [download]
    Thanks a ton! Yes, it worked!

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