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int32_t UnicodeSet::spanBackUTF8 ( const char *  s,
int32_t  length,
USetSpanCondition  spanCondition 
) const

Returns the start of the trailing substring of the input string which consists only of characters and strings that are contained in this set (USET_SPAN_CONTAINED, USET_SPAN_SIMPLE), or only of characters and strings that are not contained in this set (USET_SPAN_NOT_CONTAINED). See USetSpanCondition for details. Malformed byte sequences are treated according to contains(0xfffd). This function works faster with a frozen set and with a non-negative string length argument.

s start of the string (UTF-8)
length of the string; can be -1 for NUL-terminated
spanCondition specifies the containment condition
the start of the trailing substring according to the spanCondition; the string length if the end of the string does not fit the spanCondition ICU 3.8
See also:

Definition at line 2246 of file uniset.cpp.

References contains(), UVector::isEmpty(), NULL, U8_PREV, USET_SPAN_CONTAINED, and USET_SPAN_NOT_CONTAINED.

    if(length>0 && bmpSet!=NULL) {
        const uint8_t *s0=(const uint8_t *)s;
        return bmpSet->spanBackUTF8(s0, length, spanCondition);
    if(length<0) {
    if(length==0) {
        return 0;
    if(stringSpan!=NULL) {
        return stringSpan->spanBackUTF8((const uint8_t *)s, length, spanCondition);
    } else if(!strings->isEmpty()) {
        uint32_t which= spanCondition==USET_SPAN_NOT_CONTAINED ?
                            UnicodeSetStringSpan::BACK_UTF8_NOT_CONTAINED :
        UnicodeSetStringSpan strSpan(*this, *strings, which);
        if(strSpan.needsStringSpanUTF8()) {
            return strSpan.spanBackUTF8((const uint8_t *)s, length, spanCondition);

    if(spanCondition!=USET_SPAN_NOT_CONTAINED) {
        spanCondition=USET_SPAN_CONTAINED;  // Pin to 0/1 values.

    UChar32 c;
    int32_t prev=length;
    do {
        U8_PREV(s, 0, length, c);
        if(c<0) {
        if(spanCondition!=contains(c)) {
    } while((prev=length)>0);
    return prev;

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