> - find the first occurrence of => on the line
> - determine whether that is followed by optional whitespace and {
function FindPattern( pattern )
    let line = getline('.')

    if ( line ) {
        if ( line =~ a:pattern ) {
        # do something
        }
        else {
        # do something else
        }
    }
}
endfun

FindPattern( '=>\\s?{' )


Not tested but I think should give you some directions

-- 
Marco Arthur @ (M)arco Creatives

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