Perl-Compatible Regular Expressions (PCRE) : Regular Expressions « String « PHP






  1. PHP
  2. String
  3. Regular Expressions

Perl-Compatible Regular Expressions (PCRE)

 
\w represents a "word" character and is equivalent to the expression [A-Za-z0-9].
    
    \W represents the opposite of \w and is equivalent to [^A-Za-z0-9].
    
    \s represents a whitespace character.
    
    \S represents a nonwhitespace character.
    
    \d represents a digit and is equivalent to [0-9].
    
    \D represents a nondigit character and is equivalent to [^0-9].
    
    \n represents a newline character.
    
    \r represents a return character.
    
    \t represents a tab character.








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3.Complete list of regular expression examples
4.\b and \B, equate to "On a word boundary" and "Not on a word boundary," respectively.
5.^ and $ are line anchors.
6.Line Anchors
7.Match URL
8.Match an IP address
9.Match the smallest number of characters starting with "p" and ending with "t"
10.Matching GUIDs/UUIDs
11.Matching a Valid E-mail Address
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.Qualifiers restrict the number of times the preceding expression may appear.
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