Quantifiers: +, *, ?, {int. range}, and $ follow a character sequence: : Regular Expressions « String « PHP






Quantifiers: +, *, ?, {int. range}, and $ follow a character sequence:

 
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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13.Matching using backreferences
14.Matching with Greedy vs. Nongreedy Expressions
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17.Define a pattern and use parentheses to match individual elements within it
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19.Greedy and non-greedy matching
20.Greedy versus nongreedy matching
21.Grouping captured subpatterns
22.Validating Pascal Case Names
23.Validating U.S. Currency
24.Validating a credit card number
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26.POSIX Regular Expressions Character Classes
27.POSIX Regular Expressions Character Classes
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30.Predefined Character Ranges (Character Classes)
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32.Pattern match extenders:
33.Perl-Compatible Regular Expressions (PCRE)
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35.Quantifiers for Matching a Recurring Character
36.Special classes for regular expression
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