mb_regex_set_options

Function name: mb_regex_set_options()

Applicable version: PHP 4 >= 4.2.0, PHP 5, PHP 7

Function description: mb_regex_set_options() The function sets the options for regular expressions to be used for regular expression matching of multibyte characters.

Usage: mb_regex_set_options(string $options): bool

parameter:

• options: The options that need to be set can be a combination of the following values:
  • 'i': Case-insensitive match.
  • 'x': Ignore whitespace characters.
  • 'm': Multi-line mode.
  • 's': Treats a string as a single line, making . match all characters including newlines.
  • 'p': Use POSIX to extend the regular expression syntax.
  • 'n': No POSIX extension regular expression syntax is used.

Return value: Return true if the option is successfully set, otherwise return false.

Example:

 // 设置正则表达式选项为不区分大小写和多行模式mb_regex_set_options('im'); // 使用mb_ereg_match() 函数进行正则表达式匹配$pattern = '[az]+'; $text = 'Hello, World!'; if (mb_ereg_match($pattern, $text)) { echo '匹配成功！'; } else { echo '匹配失败！'; }

In the example above, we first use the mb_regex_set_options() function to set the regular expression options to case-insensitive and multi-line modes. Then, we use the mb_ereg_match() function to perform regular expression matching to determine whether the string $text matches the specified regular expression $pattern. If the match is successful, the output is "Match Successful!", otherwise the output is "Match Failed!".

Note that the mb_regex_set_options() function only affects regular expression functions using multibyte character sets (such as mb_ereg_match(), mb_ereg_replace(), etc.). If you want to use regular expression functions of a normal character set (such as preg_match(), preg_replace(), etc.), you should use the corresponding function to set the options.