DEELX Basic Pattern Syntax: Repeat Quantifier
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Repeat Quantifier
Make another expression repeat matching many times.
Remarks
Can make other expression repeat matching fixed times and various times.
By default, a quantified subpattern is "greedy", that is, it will match as many times as possible (given a particular starting location) while still allowing the rest of the pattern to
match.
Quantifier 
Description 
{n} 
Repeat fixed n times, example: "\w{2}" equivalent
to "\w\w" 
{m, n} 
Match n times if possible, m times least, example: "ba{1,3}"
can "ba","baa","baaa" 
{m, } 
As many as possible, m times least, example: "\w\d{2,}"
can "a12","x456"... 
? 
Match 1 time if possible, 0 time if could not match, equivalent to {0, 1} 
+ 
As many as possible, 1 times least, equivalent to {1, } 
* 
As many as possible, 0 times if could not match, equivalent to {0, } 
"Reluctant" quantifier:
If a quantifier is followed by a question mark(?), it becomes a "reluctant" quantifier. Reluctant quantifiers will match the minimum number of times possible.
Quantifier 
Description 
{m, n}? 
Match only m times if possible, at most n times. 
{m, }? 
Match only m times if possible, can match as many times as necessary. 
?? 
Match 0 time if possible, at most 1 time, equivalent to {0, 1}? 
+? 
Match only 1 time if possible, can match as many times as necessary, {1, }? 
*? 
Match 0 time if possible, can match as many times as necessary, {0, }? 
"Possessive" quantifiers:
If a quantifier is followed by a plus(+), it becomes a "possessive" quantifiers. Possessive quantifiers, which greedily match as much as they can and do not back off, even when doing so
would allow the overall match to succeed.
Quantifier 
Description 
{m, n}+ 
Match n times if possible, m times at least. 
{m, }+ 
As many times as possible, m times at least. 
?+ 
Match 1 time if possible, match 0 time if could not, equivalent to {0, 1}+ 
++ 
As many as possible, 1 times least, equivalent to {1, }+ 
*+ 
As many as possible, 0 times if could not match, equivalent to {0, }+ 
