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# 1  
Old 09-27-2010
Check for a substring
Hi,

I have a macro which I use with ROOT.
In this macro I want to check if a part of string exist so I can ignore it inside a loop. So, inside a loop I want to have something like:

Code:
if (string == "pre_ti_data_bdt*" || string == "pre_ti_data_nn*")
continue;

but of course I cannot use * in this piece of code!
How to do this trick in C++?

~faizlo
# 2  
Old 09-27-2010
If you only care about the data prior to "*", then you can use "strstr()" which checks if your string contains that data.
# 3  
Old 09-27-2010
Hi,

I care about the whole sentence, meaning I want any string that contains this part "pre_ti_data_bdt" to be passed without being calculated through the rest of the loop
# 4  
Old 09-27-2010
See man strstr.
# 5  
Old 09-27-2010
Well that should work then. If you see the occurrence of "pre_ti_data_bdt" then continue....i.e.

Code:
if(strstr(string_you_want_to_parse,"pre_ti_data_bdt") != NULL))  // pre_ti_data_bdt in string
  continue;

# 6  
Old 09-27-2010
strstr() depends on making the comparison between the part of the string, substring, and the string name. I have hundreds of these string names and I only want those that do not contain this part "pre_ti_data_bdt" or this part "pre_ti_data_nn" to go through the whole loop.
# 7  
Old 09-27-2010
Quote:
Originally Posted by faizlo
strstr() depends on making the comparison between the part of the string, substring, and the string name.
I'm not sure what you're saying here. strstr hunts for an instance of one string inside another, precisely what you want. If you want to check for two strings, call it again on the other string, and skip if either match.
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