preg_split() String into Text and Numbers [duplicate]

Answer 1

You can split it with Lookahead and Lookbehind from digit after non-digit and vice verse.

          (?<=\D)(?=\d)|(?<=\d)(?=\D)

explanation:

\D  Non-Digit [^0-9]
\d  any digit [0-9]

Here is online demo

Detail pattern explanation:

  (?<=                     look behind to see if there is:
    \D                       non-digits (all but 0-9)
  )                        end of look-behind
  (?=                      look ahead to see if there is:
    \d                       digits (0-9)
  )                        end of look-ahead

 |                        OR

  (?<=                     look behind to see if there is:
    \d                       digits (0-9)
  )                        end of look-behind
  (?=                      look ahead to see if there is:
    \D                       non-digits (all but 0-9)
  )                        end of look-ahead