POSIX Regular Expressions Character Classes : Regular Expressions « String « PHP






  1. PHP
  2. String
  3. Regular Expressions

POSIX Regular Expressions Character Classes

 
Expression            Meaning

[[:alpha:]]           A letter, such as A?Z or a?z

[[:digi:]]            A number 0?9

[[:space:]]           Whitespace, such as a tab or space character

4.60\< or \>          Word boundaries








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11.Matching a Valid E-mail Address
12.Matching a Valid IP Address
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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.Ranges
28.Option patterns:
29.Predefined Character Ranges (Character Classes)
30.Pattern matches:
31.Pattern match extenders:
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:
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37.Regular expressions using character classes