php - Regex with the following conditions -

I am trying to understand how regex works by matching a regex to the following conditions:

1. The string must start with one or more alphanumeric characters.
2. The string should be followed by the '@' sign
3. After the string 'asa' immediately after the string '@'
4. string in a string Or more of 0 and / or 1
5. string must be followed other string
6. after string

I'm around Phase 4 and now I'm stuck, collecting one or more special characters and / or numbers, no letters

7. 'abc' was thinking that E person may offer some tips:

     $ pattern = "/ ^ [a-zA-Z0- 9 @] + @ + [Asaa] + [01] /"; $ Theme = "abcB123Ccac @ asa01"; Echo preg_match ($ pattern, $ theme)? 'Match': 'no match';  

You can try regex below.

  ^ [azza-j 0-9] + asa [01] + @ [^ azza-jade] + ac $  

The code will be,

  $ pattern = "~ ^ [a-za-z0-9] + @ asa [01] + @ [^ a-za-z] + abc $ ~"; $ Theme = "abcB123Ccac @ asa01"; Echo preg_match ($ pattern, $ theme)? 'Match': 'no match';  

1. The string must start with one or more alphanumeric characters.

     ^ [A-Za-z0-9] +  

2. followed the string followed by a '@' sign Should be

     @  

3. string '@'

     asa  

+

6. String must be followed by a string containing one or more special characters and / or any other @

     @ < / Code> 

numbers, letters (except letters)

  [^ a-za-z] +  

7. ABC '' ABC ''

     ABC $