Regular expressions: Difference between revisions
→{{header|Java}}
Jazzedpineda (talk | contribs) (Omitted EasyLang) |
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=={{header|Java}}==
<syntaxhighlight lang="java">
/* match entire string against a pattern */
boolean isNumber = "-1234.567".matches("-?\\d+(?:\\.\\d+)?");
/* substitute part of string using a pattern */
String reduceSpaces = "a b c d e f".replaceAll(" +", " ");
</syntaxhighlight>
<syntaxhighlight lang="java">
import java.util.regex.Matcher;
import java.util.regex.Pattern;
...
/* group capturing example */
Pattern pattern = Pattern.compile("(?:(https?)://)?([^/]+)/(?:([^#]+)(?:#(.+))?)?");
Matcher matcher = pattern.matcher("https://rosettacode.org/wiki/Regular_expressions#Java");
if (matcher.find()) {
String protocol = matcher.group(1);
String authority = matcher.group(2);
String path = matcher.group(3);
String fragment = matcher.group(4);
}
</syntaxhighlight>
<syntaxhighlight lang="java">
/* split a string using a pattern */
String[] strings = "abc\r\ndef\r\nghi".split("\r\n?");
</syntaxhighlight>
<br />
An alternate demonstration
{{works with|Java|1.4+}}
Test
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