Regular expressions using character classes : Regular Expressions « String « PHP






  1. PHP
  2. String
  3. Regular Expressions

Regular expressions using character classes

 
Function call                                         Result
 
preg_match("/[Ff]oo/", "Foo")                         True
 
preg_match("/[^Ff]oo/", "Foo")                        False; 
 
preg_match("/[A-Z][0-9]/", "K9")                      True
 
preg_match("/[A-S]esting/", "Testing")                False; 
 
preg_match("/[A-T]esting/", "Testing")                True; 
 
preg_match("/[a-z]esting[0-9][0-9]/", "TestingAA")    False
 
preg_match("/[a-z]esting[0-9][0-9]/", "testing99")    True
 
preg_match("/[a-z]esting[0-9][0-9]/", "Testing99")    False; case sensitivity!
 
preg_match("/[a-z]esting[0-9][0-9]/i", "Testing99")   True; case problems fixed with /i
 
preg_match("/[^a-z]esting/", "Testing")               True; 
 
preg_match("/[^a-z]esting/i", "Testing")              False;








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12.Matching a Valid IP Address
13.Matching using backreferences
14.Matching with Greedy vs. Nongreedy Expressions
15.Matching with character classes and anchors
16.Matching with |
17.Define a pattern and use parentheses to match individual elements within it
18.Greedy Qualifiers
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
25.Nongreedy Qualifiers
26.POSIX Regular Expressions Character Classes
27.POSIX Regular Expressions Character Classes
28.Ranges
29.Option patterns:
30.Predefined Character Ranges (Character Classes)
31.Pattern matches:
32.Pattern match extenders:
33.Perl-Compatible Regular Expressions (PCRE)
34.Qualifiers restrict the number of times the preceding expression may appear.
35.Quantifiers for Matching a Recurring Character
36.Quantifiers: +, *, ?, {int. range}, and $ follow a character sequence:
37.Special classes for regular expression