It can be useful to validate an EMAIL address or an IP address. This pattern is used by string searching algorithms for find or replace text. (J) Allow duplicate names for subpatternsĪ regular expression is a sequence of characters that define a search pattern. (X) Turns on additional functionality of PCRE that is incompatible with Perl (U) Inverts the "greediness" of the quantifiers so that they are not greedy by default, but become greedy if followed by ? (Not compatible with Perl) (D) Dollar metacharacter matches only at the end of the subject string (A) Forced to be "anchored", that is, it is constrained to match only at the start of the string which is being searched (s) Dot metacharacter matches all characters, including newlines (u) Treat the regular expression as a sequence of Unicode code points (m) Start and end characters (^ and $) are treated as working on each line (g) Finds all the correspondences rather than stopping after the first match
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