21 lines
692 B
Plaintext
21 lines
692 B
Plaintext
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When a reluctant (or lazy) quantifier is followed by a pattern that can match the empty string or directly by the end of the regex, it will always match zero times for `+*?+` or one time for `++?+`. If a reluctant quantifier is followed directly by the end anchor (`+$+`), it behaves indistinguishably from a greedy quantifier while being less efficient.
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This is likely a sign that the regex does not work as intended.
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== Noncompliant Code Example
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----
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preg_match("/.*?x?/", $str); // Noncompliant, this will behave just like "x?"
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preg_match("/.*?/", $str); // Noncompliant, replace with "."
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----
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== Compliant Solution
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----
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preg_match("/.*?x/", $str);
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preg_match("/.*/", $str);
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----
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