def search(pattern, text):
    n, m = len(text),len(pattern)
    for i in range(n-m+1):
        j = 0
        while j < m and text[i+j] == pattern[j]:
            j +=1
        if j==m:
            return i
    return False

print search("ab", "abc")
print search("ab", "aabc")
print search("ab", "acabc")
print search("abd", "acabc")