PHP Option Patterns: – String Function

 
(pattern) = Groups the pattern to act as one item and captures it
 
    (x|y) = Matches either pattern x, or pattern y
 
    [abc] = Matches either the character a, b, or c
 
    [^abc] = Matches any character except a, b, or c
 
    [a-f] = Matches characters a through f

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