Regular expressions: Difference between revisions
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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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=={{header|langur}}==
There are several functions that can be used with regexes, such as match(), replace(), split(), etc. They can also be matched
To match a string, ...
<syntaxhighlight lang="langur">if
Or...
<syntaxhighlight lang="langur">if val .x, .y = submatch(re/(abc+).+?(def)/, "somestring") { ... }</syntaxhighlight>
Or...
<syntaxhighlight lang="langur">
case -> re/abc/: ...
...
}</syntaxhighlight>
Or...
<syntaxhighlight lang="langur">
case "somestring": ...
...
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{{libheader|Wren-pattern}}
The above module allows us to do simple string pattern matching and replacement in a similar fashion to regular expressions but using a different syntax. SenseTalk's examples have been borrowed for this purpose.
<syntaxhighlight lang="
var s = "This is a story about R2D2 and C3P0 who are best friends."
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{{libheader|Wren-regex}}
The above module uses RE2 regular expression syntax but, since it is a wrapper for Go's 'regexp' package, it can only be used from a special embedded application and not by Wren-cli.
<syntaxhighlight lang="
import "./regex" for Regex
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