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| author | Peter Stephenson <pws@zsh.org> | 2015-10-27 10:58:39 +0000 |
|---|---|---|
| committer | Peter Stephenson <pws@zsh.org> | 2015-10-27 10:58:39 +0000 |
| commit | 63fd71f171e9d282985ba24e5f3ee2507bce6f47 (patch) | |
| tree | a53bccf46abc1478ef551b7eea095c0761a8d923 | |
| parent | d45a68c5463224f43721371fb7bd4cbc24e62874 (diff) | |
| download | zsh-63fd71f171e9d282985ba24e5f3ee2507bce6f47.tar.gz zsh-63fd71f171e9d282985ba24e5f3ee2507bce6f47.tar.xz zsh-63fd71f171e9d282985ba24e5f3ee2507bce6f47.zip | |
36977: note about difficulties of pattern repetitions
| -rw-r--r-- | ChangeLog | 3 | ||||
| -rw-r--r-- | Doc/Zsh/expn.yo | 10 |
2 files changed, 13 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index 846b57ef7..b64f785f7 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,5 +1,8 @@ 2015-10-27 Peter Stephenson <p.stephenson@samsung.com> + * 36977: Doc/Zsh/expn.yo: note about complications of pattern + repetitions (#cN). + * 36974: Src/Modules/zftp.c, Src/Zle/complist.c, Src/Zle/computil.c, Src/Zle/zle_thingy.c, Src/parse.c: fix empty argument lists. diff --git a/Doc/Zsh/expn.yo b/Doc/Zsh/expn.yo index 5ea8610f2..49a0f0d53 100644 --- a/Doc/Zsh/expn.yo +++ b/Doc/Zsh/expn.yo @@ -2192,6 +2192,16 @@ inclusive. The form tt(LPAR()#c)var(N)tt(RPAR()) requires exactly tt(N) matches; tt(LPAR()#c,)var(M)tt(RPAR()) is equivalent to specifying var(N) as 0; tt(LPAR()#c)var(N)tt(,RPAR()) specifies that there is no maximum limit on the number of matches. + +Note that if the previous group of characters contains wildcards, +results can be unpredictable to the point of being logically incorrect. +It is recommended that the pattern be trimmed to match the minimum +possible. For example, to match a string of the form `tt(1_2_3_)', use +a pattern of the form `tt(LPAR()[[:digit:]]##_+RPAR()LPAR()#c3+RPAR())', not +`tt(LPAR()*_+RPAR()LPAR()#c3+RPAR())'. This arises from the +complicated interaction between attempts to match a number of +repetitions of the whole pattern and attempts to match the wildcard +`tt(*)'. ) vindex(MATCH) vindex(MBEGIN) |