Pattern Modifiers

The following list contains all possible modifiers supported by the PCRE functions in PHP. Some Perl-specific modifiers are not supported, and conversely, there are some modifiers that Perl doesn’t have.

Modifier Description
i When this modifier is used, the matching of alphabetic characters in the pattern becomes non-case-sensitive; for example, /sgi/i matches both sgi and SGI. This is equivalent to Perl’s /i modifier.
m By default, PCRE treats the subject string as consisting of a single “line” of characters (even if it actually contains several newlines). The“start of line” metacharacter (^) matches only at the start of the string, while the “end of line” metacharacter ($) matches only at the end of the string, or before ...

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