Re: How to get position of string in a mixed list? (string pattern
- To: mathgroup at smc.vnet.net
- Subject: [mg96211] Re: How to get position of string in a mixed list? (string pattern
- From: Peter Pein <petsie at dordos.net>
- Date: Mon, 9 Feb 2009 05:36:13 -0500 (EST)
- References: <gmndli$s1k$1@smc.vnet.net>
goodhei8 at gmail.com schrieb:
> 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)
>
> Thanks.
>
In[1]:=
data={"a","abc","dfe","nab",1,2,3,{1,2,"abba"}};
Position[data,s_String/;StringMatchQ[s,___~~("ab"~~___)]]
Out[2]=
{{2},{4},{8,3}}
the "trick" is to look for strings first (done by the pattern s_String) and to
apply the condition "has 'ab' somwhere in it' later