parseSep = function(s, pats)
    result = []
    startPos = 0
    pos = 0
    while pos < s.len
        for pat in pats
            if s[pos : pos+pat.len] != pat then continue
            result.push s[startPos : pos]
            result.push "{" + pat + "}"
            startPos = pos + pat.len
            pos = startPos - 1
            break
        end for
        pos = pos + 1
    end while
    return result
end function

print parseSep("a!===b=!=c", ["==", "!=", "="])