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the callout is never reached. However, with "abyd", though the result is still
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no match, the callout is obeyed.
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if the subject is not long enough, or, for unanchored patterns, if it has
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<br><a name="SEC3" href="#TOC1">THE CALLOUT INTERFACE</a><br>
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During matching, when PCRE reaches a callout point, the external function