i need regular expression in java script as well as in PHP for Indian vehicle NUMBER

here are conditions list

let expression is (x)(y)(z)(m)(a)(b)(c)

1. (x) contains only alphabets of length 2.

2. (y) may be - or single space ' '

3. (z) contains only numbers of length 2

4. (m) may be or , or single space ' '

5. length of (a) can be 2 or 3. contains alphanumeric value with minimum one alphabetic character.

6. (b) may be - or single space ' ' ( similar to (y) )

7. (c) contains only numbers of length 4

i show you the various examples of vehicle number

valid number

1. RJ-14,NL-1234

2. RJ-01,4M-5874

3. RJ-07,14M-2345

4. RJ 07,3M 2345

5. RJ-07,3M-8888

6. RJ 07 4M 2345

7. RJ 07,4M 2933

   invalid number

   RJ-07 3M 1234 ( both (y) and (b) should be same).

   RJ-07 M3-1234 ((a) must ends with alphabat).

   rj-07 M3-123 ( length of (c) must be 4).