编辑 - 注意 - 这个答案有错误/缺陷
它要求在结束引号（" 或 '）和它后面的字符之间有一个空格，以正确匹配带引号的字符串。所以" "some-text 不会被这个答案正确处理。
它可能有更多错误 - 但仅此而已。
编辑 - 替代答案
我添加了another more well optimised answer，它没有错误。
把这个留给后代。
支持
这个支持通过\"和\'转义引号和多行引号。
正则表达式
([^\s"'\\]+)*("[^"\\]*(?:\\.[^"\\]*)*"|'[^'\\]*(?:\\.[^'\\]*)*')*(\s+)
https://regex101.com/r/wT6tU2/1
替换
$1$2（是的，末尾有空格）
可视化
代码
try {
String resultString = subjectString.replaceAll("([^\\s\"'\\\\]+)*(\"[^\"\\\\]*(?:\\\\.[^\"\\\\]*)*\"|'[^'\\\\]*(?:\\\\.[^'\\\\]*)*')*(\\s+)", "$1$2 ");
} catch (PatternSyntaxException ex) {
// Syntax error in the regular expression
} catch (IllegalArgumentException ex) {
// Syntax error in the replacement text (unescaped $ signs?)
} catch (IndexOutOfBoundsException ex) {
// Non-existent backreference used the replacement text
}
人类可读
// ([^\s"'\\]+)*("[^"\\]*(?:\\.[^"\\]*)*"|'[^'\\]*(?:\\.[^'\\]*)*')*(\s+)
//
// Options: Case sensitive; Exact spacing; Dot doesn’t match line breaks; ^$ don’t match at line breaks; Default line breaks; Regex syntax only
//
// Match the regex below and capture its match into backreference number 1 «([^\s"'\\]+)*»
// Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
// You repeated the capturing group itself. The group will capture only the last iteration. Put a capturing group around the repeated group to capture all iterations. «*»
// Or, if you don’t want to capture anything, replace the capturing group with a non-capturing group to make your regex more efficient.
// Match any single character NOT present in the list below «[^\s"'\\]+»
// Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»
// A “whitespace character” (ASCII space, tab, line feed, carriage return, vertical tab, form feed) «\s»
// A single character from the list “"'” «"'»
// The backslash character «\\»
// Match the regex below and capture its match into backreference number 2 «("[^"\\]*(?:\\.[^"\\]*)*"|'[^'\\]*(?:\\.[^'\\]*)*')*»
// Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
// You repeated the capturing group itself. The group will capture only the last iteration. Put a capturing group around the repeated group to capture all iterations. «*»
// Or, if you don’t want to capture anything, replace the capturing group with a non-capturing group to make your regex more efficient.
// Match this alternative (attempting the next alternative only if this one fails) «"[^"\\]*(?:\\.[^"\\]*)*"»
// Match the character “"” literally «"»
// Match any single character NOT present in the list below «[^"\\]*»
// Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
// The literal character “"” «"»
// The backslash character «\\»
// Match the regular expression below «(?:\\.[^"\\]*)*»
// Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
// Match the backslash character «\\»
// Match any single character that is NOT a line break character (line feed, carriage return, next line, line separator, paragraph separator) «.»
// Match any single character NOT present in the list below «[^"\\]*»
// Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
// The literal character “"” «"»
// The backslash character «\\»
// Match the character “"” literally «"»
// Or match this alternative (the entire group fails if this one fails to match) «'[^'\\]*(?:\\.[^'\\]*)*'»
// Match the character “'” literally «'»
// Match any single character NOT present in the list below «[^'\\]*»
// Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
// The literal character “'” «'»
// The backslash character «\\»
// Match the regular expression below «(?:\\.[^'\\]*)*»
// Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
// Match the backslash character «\\»
// Match any single character that is NOT a line break character (line feed, carriage return, next line, line separator, paragraph separator) «.»
// Match any single character NOT present in the list below «[^'\\]*»
// Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
// The literal character “'” «'»
// The backslash character «\\»
// Match the character “'” literally «'»
// Match the regex below and capture its match into backreference number 3 «(\s+)»
// Match a single character that is a “whitespace character” (ASCII space, tab, line feed, carriage return, vertical tab, form feed) «\s+»
// Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»