Regular Expressions 101

Explanation

Pro

Definition Group(?(DEFINE) (?P<id>[\d-]+) )

Group id(?P<id>[\d-]+)

Character Class[\d-]+

+matches at least one character from the set below:

\da digit

-the literal - (45₁₀ / 55₈ / 2D₁₆)

id:the literal text id: (case sensitive)

\sany whitespace character

(?&id)calls group id as a subroutine

Group 2(,\s(?&id))*

*repeats the group contents below any number of times:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\sany whitespace character

(?&id)calls group id as a subroutine

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

Detailed match information will be displayed here automatically.

25 tokens

(?(DEFINE)
  (?P<id>[\d-]+)
)
id:\s(?&id)(,\s(?&id))*

New

don't match this date: 2020-10-22 but match this id: 5668-235 as well as these id: 7788-58-2, 8688-25, 74-44558

don't match this date: 2020-10-22 but match this id: 5668-235 as well as these id: 7788-58-2, 8688-25, 74-44558