PHP Quantifiers For Matching Recurring Character – String Function

Symbol         Description                                      Example
*              Zero or more instances                           a*
+              One or more instances                            a+
?              Zero or one instance                             a?
{n}            n instances                                      a{3}
{n,}           At least n instances                             a{3,}
{,n}           Up to n instances                                a{,2}
{n1, n2}       At least n1 instances, no more than n2 instances a{1,2}

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