Character Classes : Regular Expressions « String « PHP






Character Classes

 
[ indicates the beginning of a character class. 
- indicates a range inside a character class (unless it is first in the class). 
^ indicates a negated character class (if found first). 
] indicates the end of a character class.
  
  








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1.Brackets [] finds a range of characters.
2.Complete list of regular expression examples
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7.Match an IP address
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11.Matching a Valid IP Address
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16.Define a pattern and use parentheses to match individual elements within it
17.Greedy Qualifiers
18.Greedy and non-greedy matching
19.Greedy versus nongreedy matching
20.Grouping captured subpatterns
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22.Validating U.S. Currency
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25.POSIX Regular Expressions Character Classes
26.POSIX Regular Expressions Character Classes
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29.Predefined Character Ranges (Character Classes)
30.Pattern matches:
31.Pattern match extenders:
32.Perl-Compatible Regular Expressions (PCRE)
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34.Quantifiers for Matching a Recurring Character
35.Quantifiers: +, *, ?, {int. range}, and $ follow a character sequence:
36.Special classes for regular expression
37.Regular expressions using character classes