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예 4. using /e modifier
example 4.

참고: this modifier was not available in php3.
this modifier was not available in php3.

/\w+\s*\w+/j - unknown modifier 'j'
/href=' (.*) '- missing ending delimiter

% 1 (% 2) @ tag/ modifier/ modifier@ title/ plain
%1 (%2)

if this modifier is set, letters in the pattern match both upper and lower case letters.
if this modifier is set, letters in the pattern match both upper and lower case letters.

only preg_replace() uses this modifier; it is ignored by other pcre functions.
only preg_replace() uses this modifier; it is ignored by other pcre functions.

if this modifier is set, preg_replace() does normal substitution of backreferences in the replacement string, evaluates it as php code, and uses the result for replacing the search string.
whitespace characters may never appear within special character sequences in a pattern, for example within the sequence (? (which introduces a conditional subpattern.

/e modifier makes preg_replace() treat the replacement parameter as php code after the appropriate references substitution is done. tip: make sure that replacement constitutes a valid php code string, otherwise php will complain about a parse error at the line containing preg_replace().
tip: make sure that replacement constitutes a valid php code string, otherwise php will complain about a parse error at the line containing preg_replace().