Parsing

[nortti]

'metaUrl' :/metafile.asx?MSG=rd2hY67FGH6TbCLhQrcH0Tf0wZVitlqhMuHmRs9zQV2SYUPpMfOEe5lCuQxbiC1hjH4s4q7SwKz)w(jK5s0Q)w9JKwpLPLnqrA1H2r2aVqUu7hnEEIXMNSvCLWiRiMqu',

I need only "MSG=rd2hY67FGH6TbCLhQrcH0Tf0wZVitlqhMuHmRs9zQV2SY UPpMfOEe5lCuQxbiC1hjH4s4q7SwKz)w(jK5s0Q)w9JKwpLPLn qrA1H2r2aVqUu7hnEEIXMNSvCLWiRiMqu"

How to remove other things? (using shell commands)

[RobinVossen]

I'd either use perl or sed/awk for this.
However as my sed/awk knowledge is near to zero I'd advice you to Google some.

Using regex this would be a breeze.
The regex you want is:

MSG=[^\']*

Hope that helps