Detecting first characters in a line ?

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Hi,
I'm trying to implement a custom script used for commenting and
uncommenting , we have two types , like c-style `//' and shell-style `#'
, how can i detect the first characters ?

PS: i'm current with two key bindings , which should be combined , it's
possible right ?

Many thanks !

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Best Regards,
Aaron Lewis - PGP: 0x4A6D32A0
FingerPrint EA63 26B2 6C52 72EA A4A5 EB6B BDFE 35B0 4A6D 32A0
irc: A4r0n on freenode
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