php - preg_match_all get the end of the expression

one text

Solution:

The match should end with a closing ] but the Parameters group can contain [ and ] as well.

One option is to match as least as possible characters until you reach another part that starts with 3G or EL or the end of the string after the closing square bracket.

\[(?P<Manufacture>3G|EL)\*(?P<DeviceId>[0-9]{10})\*(?P<Length>[A-Z0-9]{4})\*(?P<Command>[^[,\r\n]*)(?:,(?P<Parameters>.*?(?=](?:\[(?:3G|EL)|$))))?]

Explanation

• \[ Match [
• (?P<Manufacture>3G|EL)\* Named group Manufacture match either 3G or EL and *
• (?P<DeviceId>[0-9]{10})\* Named group DeviceId match 10 digits and *
• (?P<Length>[A-Z0-9]{4})\* Named group Length match 4 times one of A-Z or 0-9
• (?P<Command>[^[,\r\n]*) Named group Command match [ followed by any char except [ , or a newline
• (?: Non capture group
  • ,(?P<Parameters>.*? Match a , followed by any char as least as possible in group Parameters
  • (?=](?:\[(?:3G|EL)|$)) Positive lookahead to assert what is at the right is either [3G or [EL or the end of the string
• )? Close non capture group and make it optional
• ] Match closing ]

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