XML Meta characters

Meta Character	Description	Example
.	Matches any character	a.b matches abb, a1b, a@b etc.,
?	Zero or one occurrence	a?b matches  b, ab
*	Zero or more occurrences	a*b matches b, ab, aab, aaab etc.,
+	One or more occurrences	a+b matches ab, aab, aaab etc.,
|	Or operator	ab|cd matches ab or cd.
()	grouping	A(b|c)d matches abd or acd.
[]	range	A[a-z]x matches abx, azx, acx etc.,
{n}	Exactly n times	a{5} matches aaaaa
{n,m}	Matches between n and m times	a{3-5} matches aaa, aaaa, aaaaa
{n, }	Matches n or more times	a{3, } matches aaa, aaaa, aaaaa etc.,

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