Any comments would be appreciated:

```
def match(s, p):
m, n = len(s), len(p)
dp = [[False for j in range(n+1)] for i in range(m+1)]
dp[0][0] = True
for i in range(1, m+1):
dp[i][0] = False
for j in range(1, n+1):
dp[0][j] = (j > 1) and p[j-1] == '*' and dp[0][j-2]
for i in range(1, m+1):
for j in range(1, n+1):
if p[j-1] == '+':
dp[i][j] = (dp[i-1][j-2] or dp[i-1][j]) and s[i-1] == p[j-2]
elif p[j-1] != '*':
dp[i][j] = dp[i-1][j-1] and (s[i-1] == p[j-1] or p[j-1] == '.')
else:
dp[i][j] = dp[i][j-2] or (s[i-1] == p[j-2] or p[j-2] == '.') and dp[i-1][j]
return dp[m][n]
if __name__ == '__main__':
assert match('abc', '.*abc') == True
assert match('abba', 'abba') == True
assert match('adb', 'cda') == False
assert match('ababc', '.*abc') == True
assert match('caaa', '.b*a+') == True
assert match('baa', 'bb+a*') == False
assert match('b', 'b+') == True
assert match('ba', 'b+') == False
assert match('ab', 'b+') == False
assert match('ab', 'a+b+') == True
```