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(Simple Match Data): Warn about match data being set anew by every search.

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Eli Zaretskii 2006-05-19 19:47:14 +00:00
parent 892eb23701
commit 5345f90dfa
1 changed files with 6 additions and 0 deletions
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6
lispref/searching.texi
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@ -1264,6 +1264,12 @@ subexpression is numbered 1, the second 2, and so on. Only regular
expressions can have subexpressions---after a simple string search, the
only information available is about the entire match.
Every successful search sets the match data. Therefore, you should
query the match data immediately after searching, before calling any
other function that might perform another search. Alternatively, you
may save and restore the match data (@pxref{Saving Match Data}) around
the call to functions that could perform another search.
A search which fails may or may not alter the match data. In the
past, a failing search did not do this, but we may change it in the
future. So don't try to rely on the value of the match data after