Repeating specific regex pattern

Question

I have a regex pattern:

boost::regex regex = "@ABC-\\d+"

which means pattern starting with @ABC- and followed by one or more digits.
I want this pattern to be able to match this pattern one or more times that is:

boost::regex regex = "@ABC-\\d+@ABC-\\d+@ABC-\\d+@ABC-\\d+etc, etc"

[`R"(^(@ABC-\d+)+$)"`](https://regex101.com/r/qO5oO3/1) - is that what you need? — Wiktor Stribiżew, Feb 26 '16 at 12:08
@WiktorStribiżew hi, yep, that's why I've asked this question. Thanks by the way it works. Make it an answer and I will accept it. Best regards — There is nothing we can do, Feb 26 '16 at 12:19

score 1 · Accepted Answer · edited May 23 '17 at 10:28

Use a grouping construct and apply a quantifier to it, and use ^ and $ anchors to make sure the whole string is matched against the pattern:

Example:

R"(^(@ABC-\d+)+$)"

or - with a non-capturing group that will never create a capture inside the memory buffer (this grouping construct is meant to only group subpatterns to match string sequences):

R"(^(?:@ABC-\d+)+$)"
     ^^

If the string can be empty, replace the last + with *: R"(^(@ABC-\d+)*$)".

Note that in C++, raw string literals are preferred when declaring regular expression patterns to avoid excessive backslashes.

Repeating specific regex pattern

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