indexof()

Syntax

indexof(source,lookup[,start_index[,length[,occurrence]]])

Arguments

• source: Input string.
• lookup: String to look up.
• start_index: Search start position. A negative value will offset the starting search position from the end of the source by this many steps: abs(start_index). Optional.
• length: Number of character positions to examine. A value of -1 means unlimited length. Optional.
• occurrence: The number of the occurrence. Default 1. Optional.

Returns

Zero-based index position of lookup.

Returns -1 if the string isn't found in the input.

For irrelevant inputs (occurrence < 0 or length < -1) - returns null.

Examples

print
 idx1 = indexof("abcdefg","cde")    // lookup found in input string
 , idx2 = indexof("abcdefg","cde",1,4) // lookup found in researched range
 , idx3 = indexof("abcdefg","cde",1,2) // search starts from index 1, but stops after 2 chars, so full lookup can't be found
 , idx4 = indexof("abcdefg","cde",3,4) // search starts after occurrence of lookup
 , idx5 = indexof("abcdefg","cde",-5)  // negative start index
 , idx6 = indexof(1234567,5,1,4)       // two first parameters were forcibly casted to strings "12345" and "5"
 , idx7 = indexof("abcdefg","cde",2,-1)  // lookup found in input string
 , idx8 = indexof("abcdefgabcdefg", "cde", 1, 10, 2)   // lookup found in input range
 , idx9 = indexof("abcdefgabcdefg", "cde", 1, -1, 3)   // the third occurrence of lookup is not in researched range