14.2. POSIX Style

In addition to Perl-style regular expressions, PHP supports POSIX-style regular expressions. Depending on which style you like best, you can decide whether you want to use Perl-style or POSIX-style regular expressions.

PHP supports a set of functions related to regular expressions:

  • ereg— Looks for matches

  • ereg_replac— Performs substitutions

  • eregi— Performs case-insensitive matching

  • eregi_replac— Performs substitutions based on case-insensitive matching

  • split— Splits a string based on regular expressions

  • spliti— Splits a string based on regular expressions based on case-insensitive matching

  • sql_regcase— Creates a regular expression matching the string passed to the function

After you have seen which functions are provided by PHP, you ...

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