PHP Quantifiers: +, *, ?, {Int. Range}, And $ Follow Character Sequence: – String Function

 
p+ matches any string containing at least one p.
p* matches any string containing zero or more p's.
p? matches any string containing zero or more p's. This is just an alternative way to use p*.
p{2} matches any string containing a sequence of two p's.
p{2,3} matches any string containing a sequence of two or three p's.
p{2, } matches any string containing a sequence of at least two p's.
p$ matches any string with p at the end of it.
^p matches any string with p at the beginning of it.
[^a?zA?Z] matches any string not containing any of the characters ranging from a through z and A through Z.
p.p matches any string containing p, followed by any character, in turn followed by another p.

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