index Of
Returns the index within this string of the first occurrence of the specified substring. The integer returned is the smallest value k such that:
this.toString().startsWith(str, <i>k</i>)
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true
.Return
if the string argument occurs as a substring within this object, then the index of the first character of the first such substring is returned; if it does not occur as a substring, -1
is returned.
Parameters
str
any string.
Returns the index within this string of the first occurrence of the specified substring, starting at the specified index. The integer returned is the smallest value k
for which:
k >= Math.min(fromIndex, this.length()) &&
this.toString().startsWith(str, k)
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Return
the index within this string of the first occurrence of the specified substring, starting at the specified index.
Parameters
str
the substring for which to search.
from Index
the index from which to start the search.