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strstr
format:
#strstr
{string1} {string2}
Similar to C function strstr(char* str1, char* str2).
Find the 1st occurence of str2 from str1, then return 0 based
index of str1. Return value is assigned to $_.
If there is no match, -1 is assigned to $_.
See also: strrchr, strstr, substr, ord, chr