感谢这里的每个人的贡献。我写的转换比以前的任何答案都更全面：
public static final String convertGlobToRegex(String pattern) {
StringBuilder sb = new StringBuilder(pattern.length());
int inGroup = 0;
int inClass = 0;
int firstIndexInClass = -1;
char[] arr = pattern.toCharArray();
for (int i = 0; i < arr.length; i++) {
char ch = arr[i];
switch (ch) {
case '\\':
if (++i >= arr.length) {
sb.append('\\');
} else {
char next = arr[i];
switch (next) {
case ',':
break;
case 'Q':
case 'E':
sb.append('\\');
default:
sb.append('\\');
}
sb.append(next);
}
break;
case '*':
if (inClass == 0)
sb.append(".*");
else
sb.append('*');
break;
case '?':
if (inClass == 0)
sb.append('.');
else
sb.append('?');
break;
case '[':
inClass++;
firstIndexInClass = i+1;
sb.append('[');
break;
case ']':
inClass--;
sb.append(']');
break;
case '.':
case '(':
case ')':
case '+':
case '|':
case '^':
case '$':
case '@':
case '%':
if (inClass == 0 || (firstIndexInClass == i && ch == '^'))
sb.append('\\');
sb.append(ch);
break;
case '!':
if (firstIndexInClass == i)
sb.append('^');
else
sb.append('!');
break;
case '{':
inGroup++;
sb.append('(');
break;
case '}':
inGroup--;
sb.append(')');
break;
case ',':
if (inGroup > 0)
sb.append('|');
else
sb.append(',');
break;
default:
sb.append(ch);
}
}
return sb.toString();
}
并通过单元测试证明其有效：
public class StringUtils_ConvertGlobToRegex_Test {
@Test
public void star_becomes_dot_star() throws Exception {
assertEquals("gl.*b", StringUtils.convertGlobToRegex("gl*b"));
}
@Test
public void escaped_star_is_unchanged() throws Exception {
assertEquals("gl\\*b", StringUtils.convertGlobToRegex("gl\\*b"));
}
@Test
public void question_mark_becomes_dot() throws Exception {
assertEquals("gl.b", StringUtils.convertGlobToRegex("gl?b"));
}
@Test
public void escaped_question_mark_is_unchanged() throws Exception {
assertEquals("gl\\?b", StringUtils.convertGlobToRegex("gl\\?b"));
}
@Test
public void character_classes_dont_need_conversion() throws Exception {
assertEquals("gl[-o]b", StringUtils.convertGlobToRegex("gl[-o]b"));
}
@Test
public void escaped_classes_are_unchanged() throws Exception {
assertEquals("gl\\[-o\\]b", StringUtils.convertGlobToRegex("gl\\[-o\\]b"));
}
@Test
public void negation_in_character_classes() throws Exception {
assertEquals("gl[^a-n!p-z]b", StringUtils.convertGlobToRegex("gl[!a-n!p-z]b"));
}
@Test
public void nested_negation_in_character_classes() throws Exception {
assertEquals("gl[[^a-n]!p-z]b", StringUtils.convertGlobToRegex("gl[[!a-n]!p-z]b"));
}
@Test
public void escape_carat_if_it_is_the_first_char_in_a_character_class() throws Exception {
assertEquals("gl[\\^o]b", StringUtils.convertGlobToRegex("gl[^o]b"));
}
@Test
public void metachars_are_escaped() throws Exception {
assertEquals("gl..*\\.\\(\\)\\+\\|\\^\\$\\@\\%b", StringUtils.convertGlobToRegex("gl?*.()+|^$@%b"));
}
@Test
public void metachars_in_character_classes_dont_need_escaping() throws Exception {
assertEquals("gl[?*.()+|^$@%]b", StringUtils.convertGlobToRegex("gl[?*.()+|^$@%]b"));
}
@Test
public void escaped_backslash_is_unchanged() throws Exception {
assertEquals("gl\\\\b", StringUtils.convertGlobToRegex("gl\\\\b"));
}
@Test
public void slashQ_and_slashE_are_escaped() throws Exception {
assertEquals("\\\\Qglob\\\\E", StringUtils.convertGlobToRegex("\\Qglob\\E"));
}
@Test
public void braces_are_turned_into_groups() throws Exception {
assertEquals("(glob|regex)", StringUtils.convertGlobToRegex("{glob,regex}"));
}
@Test
public void escaped_braces_are_unchanged() throws Exception {
assertEquals("\\{glob\\}", StringUtils.convertGlobToRegex("\\{glob\\}"));
}
@Test
public void commas_dont_need_escaping() throws Exception {
assertEquals("(glob,regex),", StringUtils.convertGlobToRegex("{glob\\,regex},"));
}
}