jodd-core/src/main/java/jodd/util/StringUtil.java
public static int indexOfIgnoreCase(final String src, final String subS) {
		return indexOfIgnoreCase(src, subS, 0, src.length());
	}
public static int indexOfIgnoreCase(final String src, final String subS) {
		return indexOfIgnoreCase(src, subS, 0, src.length());
	}
Finds first index of a substring in the given source string with ignored case.

@param src    source string for examination
@param subS   substring to find

@return index of founded substring or -1 if substring is not found
@see #indexOfIgnoreCase(String, String, int)