Re: How to get position of string in a mixed list? (string pattern in
- To: mathgroup at smc.vnet.net
- Subject: [mg96217] Re: How to get position of string in a mixed list? (string pattern in
- From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
- Date: Mon, 9 Feb 2009 05:37:18 -0500 (EST)
- Organization: The Open University, Milton Keynes, UK
- References: <gmndli$s1k$1@smc.vnet.net>
In article <gmndli$s1k$1 at smc.vnet.net>,
"goodhei8 at gmail.com" <goodhei8 at gmail.com> wrote:
> for list like {"a","abc","dfe","nab",1,2,3,{1,2}}, I want to get all
> strings' position in the list which match a pattern (like
> ___~~"ab"~~___). How to do it? How to use a string pattern in a list
> pattern? how to use a pattern with a condition (both list pattern&/;
> StringQ[#] and list pattern /;StringQ[]&, no working for me)
StringMatchQ[] is the answer as in,
In[1]:= lst = {"a", "abc", "dfe", "nab", 1, 2, 3, {1, 2}};
In[2]:= Cases[lst, s_String /; StringMatchQ[s, ___ ~~ "ab" ~~ ___]]
Out[2]= {"abc", "nab"}
In[3]:= Position[lst,
s_String /; StringMatchQ[s, ___ ~~ "ab" ~~ ___]]
Out[3]= {{2}, {4}}
Regards,
--Jean-Marc