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String Comparison

Posted by sonali.birari (sonali.birari), 14 December 2006
How to compare two strings:

There are 2 strings:
string1: "Apple a day"
string2: "Apple a day keeps doctor away"

I tried following options:
1) puts [string equal $string2 *$string1*] : Output: 0
2) puts [string match $string2 *$string1*] : Output: 0
3) puts [string compare $string2 *$string1*] : Output: 1

How this "string equal", "string match" and "string compare" works?

Which option is the correct one for String comparison?
Is there any other method for the same?


Posted by admin (Graham Ellis), 14 December 2006
The correct choice depends on what you want to do.

string equal tests if the strings are equal

string match looks to see if the first string is a substring of the second (it's the other way round in your case, so you got 0)

string compare checks which string comes first and which comes second if you sort them, and retruns -1, 0 or 1.

There's also regexp for you to look at

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