([a-d]{5})+
Answer:
It matches one or more groups of five characters, where each group consists only of the characters 'a' through 'd'.
It does match:
aaaaa aaaaabbbbb abcdaddcca
It does not match:
aa aaaaab aaaaabbaaaaa
([a-d]{5})+
It matches one or more groups of five characters, where each group consists only of the characters 'a' through 'd'.
It does match:
aaaaa aaaaabbbbb abcdaddcca
It does not match:
aa aaaaab aaaaabbaaaaa
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The subexpression X{n,m} means to match at least n
but no more than m, of the subexpression X.
The numbers n and m must be literal constants, like 5, or 0, or 23.
Of course, n must be less than m.
For example
[a-d]{2,7}
means to match between two and seven (inclusive) characters, where the characters are selected from 'a' through 'd'. The following strings match:
aa aaaaaaa abc addbcc
These strings do not match:
a abcdabcd axaaa
Describe the strings matched by the following
[ABC]{2,4}[XYZ]{2,4}