Examples of java.util.regex.Pattern.split()

java.util.regex.Pattern.split()

Splits the given input sequence around matches of this pattern.

The array returned by this method contains each substring of the input sequence that is terminated by another subsequence that matches this pattern or is terminated by the end of the input sequence. The substrings in the array are in the order in which they occur in the input. If this pattern does not match any subsequence of the input then the resulting array has just one element, namely the input sequence in string form.

The limit parameter controls the number of times the pattern is applied and therefore affects the length of the resulting array. If the limit n is greater than zero then the pattern will be applied at most n - 1 times, the array's length will be no greater than n, and the array's last entry will contain all input beyond the last matched delimiter. If n is non-positive then the pattern will be applied as many times as possible and the array can have any length. If n is zero then the pattern will be applied as many times as possible, the array can have any length, and trailing empty strings will be discarded.

The input "boo:and:foo", for example, yields the following results with these parameters:

Regex

Limit

Result

: 2 { "boo", "and:foo" }

: 5 { "boo", "and", "foo" }

: -2 { "boo", "and", "foo" }

o 5 { "b", "", ":and:f", "", "" }

o -2 { "b", "", ":and:f", "", "" }

o 0 { "b", "", ":and:f" }

@param input The character sequence to be split @param limit The result threshold, as described above @return The array of strings computed by splitting the inputaround matches of this pattern

Regex	Limit	Result
:	2	`{ "boo", "and:foo" }`
:	5	`{ "boo", "and", "foo" }`
:	-2	`{ "boo", "and", "foo" }`
o	5	`{ "b", "", ":and:f", "", "" }`
o	-2	`{ "b", "", ":and:f", "", "" }`
o	0	`{ "b", "", ":and:f" }`

    assertEquals(Pattern.compile("o").split("boo:and:foo", 5).length, 5);
    assertEquals(Pattern.compile("b").split("ab", -1).length, 2);
    // bug5391
    String s[];
    Pattern pat = Pattern.compile("x");
    s = pat.split("zxx:zzz:zxx", 10);
    assertEquals(s.length, 5);
    s = pat.split("zxx:zzz:zxx", 3);
    assertEquals(s.length, 3);
    s = pat.split("zxx:zzz:zxx", -1);
    assertEquals(s.length, 5);

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    // bug5391
    String s[];
    Pattern pat = Pattern.compile("x");
    s = pat.split("zxx:zzz:zxx", 10);
    assertEquals(s.length, 5);
    s = pat.split("zxx:zzz:zxx", 3);
    assertEquals(s.length, 3);
    s = pat.split("zxx:zzz:zxx", -1);
    assertEquals(s.length, 5);
    s = pat.split("zxx:zzz:zxx", 0);
    assertEquals(s.length, 3);

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    Pattern pat = Pattern.compile("x");
    s = pat.split("zxx:zzz:zxx", 10);
    assertEquals(s.length, 5);
    s = pat.split("zxx:zzz:zxx", 3);
    assertEquals(s.length, 3);
    s = pat.split("zxx:zzz:zxx", -1);
    assertEquals(s.length, 5);
    s = pat.split("zxx:zzz:zxx", 0);
    assertEquals(s.length, 3);
    // other splitting
    // negative limit

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    assertEquals(s.length, 5);
    s = pat.split("zxx:zzz:zxx", 3);
    assertEquals(s.length, 3);
    s = pat.split("zxx:zzz:zxx", -1);
    assertEquals(s.length, 5);
    s = pat.split("zxx:zzz:zxx", 0);
    assertEquals(s.length, 3);
    // other splitting
    // negative limit
    pat = Pattern.compile("b");
    s = pat.split("abccbadfebb", -1);

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    s = pat.split("zxx:zzz:zxx", 0);
    assertEquals(s.length, 3);
    // other splitting
    // negative limit
    pat = Pattern.compile("b");
    s = pat.split("abccbadfebb", -1);
    assertEquals(s.length, 5);
    s = pat.split("", -1);
    assertEquals(s.length, 1);
    pat = Pattern.compile("");
    s = pat.split("", -1);

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    // other splitting
    // negative limit
    pat = Pattern.compile("b");
    s = pat.split("abccbadfebb", -1);
    assertEquals(s.length, 5);
    s = pat.split("", -1);
    assertEquals(s.length, 1);
    pat = Pattern.compile("");
    s = pat.split("", -1);
    assertEquals(s.length, 1);
    s = pat.split("abccbadfe", -1);

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    s = pat.split("abccbadfebb", -1);
    assertEquals(s.length, 5);
    s = pat.split("", -1);
    assertEquals(s.length, 1);
    pat = Pattern.compile("");
    s = pat.split("", -1);
    assertEquals(s.length, 1);
    s = pat.split("abccbadfe", -1);
    assertEquals(s.length, 11);
    // zero limit
    pat = Pattern.compile("b");

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    s = pat.split("", -1);
    assertEquals(s.length, 1);
    pat = Pattern.compile("");
    s = pat.split("", -1);
    assertEquals(s.length, 1);
    s = pat.split("abccbadfe", -1);
    assertEquals(s.length, 11);
    // zero limit
    pat = Pattern.compile("b");
    s = pat.split("abccbadfebb", 0);
    assertEquals(s.length, 3);

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    assertEquals(s.length, 1);
    s = pat.split("abccbadfe", -1);
    assertEquals(s.length, 11);
    // zero limit
    pat = Pattern.compile("b");
    s = pat.split("abccbadfebb", 0);
    assertEquals(s.length, 3);
    s = pat.split("", 0);
    assertEquals(s.length, 1);
    pat = Pattern.compile("");
    s = pat.split("", 0);

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    assertEquals(s.length, 11);
    // zero limit
    pat = Pattern.compile("b");
    s = pat.split("abccbadfebb", 0);
    assertEquals(s.length, 3);
    s = pat.split("", 0);
    assertEquals(s.length, 1);
    pat = Pattern.compile("");
    s = pat.split("", 0);
    assertEquals(s.length, 1);
    s = pat.split("abccbadfe", 0);

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