如何最简单地从字符串中获取数字？我有很多这样的链接列表，我需要从中获取该编号98548。
https://address.com/admin/customers/98548/contacts
请注意，数字不能具有不同的数字计数，并且可以从0到9开始
答案 0 :(得分：2)
这是我所知道的最简单的方法：
str <- "https://address.com/admin/customers/98548/contacts"
str_extract_all(str, "\\d+")[[1]]
答案 1 :(得分：1)
使用@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(basePackages= {"package path"})
@PropertySource("classpath:application.properties")
public class PersistanceConfiguration {
@Autowired
private Environment env;
public Environment getEnv() {
return env;
}
public void setEnv(Environment env) {
this.env = env;
}
@Bean
LocalContainerEntityManagerFactoryBean entityManagerFactory() throws NamingException {
LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
entityManagerFactoryBean.setDataSource(dataSource());
entityManagerFactoryBean.setJpaVendorAdapter(new HibernateJpaVendorAdapter());
entityManagerFactoryBean.setPackagesToScan("entity path");
Properties jpaProperties = new Properties();
//Configures the used database dialect. This allows Hibernate to create SQL
//that is optimized for the used database.
jpaProperties.put("hibernate.dialect", env.getRequiredProperty("hibernate.dialect"));
entityManagerFactoryBean.setJpaProperties(jpaProperties);
return entityManagerFactoryBean;
}
@Bean
public DataSource dataSource() throws NamingException {
JndiObjectFactoryBean bean = new JndiObjectFactoryBean();
bean.setJndiName("java:comp/env/jdbc/CPUDB");
bean.setProxyInterface(DataSource.class);
bean.setLookupOnStartup(false);
bean.afterPropertiesSet();
return (DataSource) bean.getObject();
}
@Bean
JpaTransactionManager transactionManager(EntityManagerFactory entityManagerFactory) {
JpaTransactionManager transactionManager = new JpaTransactionManager();
transactionManager.setEntityManagerFactory(entityManagerFactory);
return transactionManager;
}
}
：
stringr