Pattern match extenders: : Regular Expressions « String « PHP






  1. PHP
  2. String
  3. Regular Expressions

Pattern match extenders:

 
? = Previous item is match 0 or 1 times.
    
    
    
    * = Previous item is matched 0 or more times.
    
    
    
    + = Previous item is matched 1 or more times.
    
    
    
    {n} = Previous item is matched exactly n times.
    
    
    
    {n,} = Previous item is matched at least n times.
    
    
    
    {n,m} = Previous item is matched at least n and at most m times.
    
    
    
    ? (after any of above) = Match as few as possible times.








Related examples in the same category

1.Brackets [] finds a range of characters.
2.Character Classes
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.Perl-Compatible Regular Expressions (PCRE)
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