Regular Expressions Regex modifiers (flags) PCRE_INFO_JCHANGED modifier


Example

One more PCRE modifier that allows the use of duplicate named groups.

NOTE: only inline version is supported - (?J), and must be placed at the start of the pattern.

If you use

/(?J)\w+-(?:new-(?<val>\w+)|\d+-empty-(?<val>[^-]+)-collection)/

the "val" group values will be never empty (will always be set). A similar effect can be achieved with branch reset though.