Expresions regulars

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# Expresions regulars
### Regex

.footnote[Joan Puigcerver Ibáñez]

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# Regex
- Defineix un patro de cerca en un text.

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# Tutorial

- [https://regexone.com/](https://regexone.com/)
- Fes fins a la lliço 10 (inclosa).

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# Regex Java
- Podem definir una regex dins d'un string.
- Les \ les hem d'espar (\\).
- Exemple
	- Regex: \w
	- Java: "\\w"

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# Regex Java
- Funcions de String

```
boolean matches = string.matches("regex");
String[] split = string.split("regex");
String oneReplaced = string.replaceFirst("regex", "replacement");
String allReplaced = string.replaceAll("regex", "replacement");
```

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# Regex Java

```
Pattern pattern = Pattern.compile("\\w+");
// in case you would like to ignore case sensitivity,
// you could use this statement:
// Pattern pattern = Pattern.compile("\\s+", Pattern.CASE_INSENSITIVE);
Matcher matcher = pattern.matcher(EXAMPLE_TEST);
// check all occurance
while (matcher.find()) {
    System.out.print("Start index: " + matcher.start());
    System.out.print(" End index: " + matcher.end() + " ");
    System.out.println(matcher.group());
}
```