前言

• jdk 1.8

split函數(shù)

注意，split函數(shù)的參數(shù)是正則表達(dá)式。split函數(shù)的定義為：

/*** Splits this string around matches of the given <a* href="../util/regex/Pattern.html#sum">regular expression</a>.** <p> This method works as if by invoking the two-argument {@link* #split(String, int) split} method with the given expression and a limit* argument of zero. Trailing empty strings are therefore not included in* the resulting array.** <p> The string {@code "boo:and:foo"}, for example, yields the following* results with these expressions:** <blockquote><table cellpadding=1 cellspacing=0 summary="Split examples showing regex and result">* <tr>* <th>Regex</th>* <th>Result</th>* </tr>* <tr><td align=center>:</td>* <td>{@code { "boo", "and", "foo" }}</td></tr>* <tr><td align=center>o</td>* <td>{@code { "b", "", ":and:f" }}</td></tr>* </table></blockquote>*** @param regex* the delimiting regular expression** @return the array of strings computed by splitting this string* around matches of the given regular expression** @throws PatternSyntaxException* if the regular expression's syntax is invalid** @see java.util.regex.Pattern** @since 1.4* @spec JSR-51*/ public String[] split(String regex) { ... }

特殊符號的處理

split函數(shù)的參數(shù)是正則表達(dá)式，則正則表達(dá)式的特殊符號作為分隔符時，就需要特殊處理。

比如，.在正則表達(dá)式中是通配符，匹配除換行符（\n、\r）之外的任何單個字符。

對特殊符號的處理方法有兩種：

• 轉(zhuǎn)義。比如，\.
• 放到中括號里。比如，[.]

示例

String[] s1 = "a.b.c".split("\\."); System.out.println(Arrays.asList(s1)); //[a, b, c]String[] s2 = "a.b.c".split("[.]"); System.out.println(Arrays.asList(s2)); //[a, b, c]

參考

https://www.runoob.com/regexp/regexp-metachar.html

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