从复杂的字符串中提取模式

Question

如何从看起来像这样的字符串中提取模式S及其后的数字？

例如xxxx_x_S1_XXXXX_C-_x.txt

我只想要S1

有人可以帮我吗？

非常感谢

Answer 1

您可以使用gsub

string = "xxxx_x_S1_XXXXX_C-_x.txt"
gsub(".*_(S\\d+)_.*","\\1",string)
"S1"

Answer 2

可以很容易地完成

stringr::str_extract("xxxx_x_S1_XXXXX_C-_x.txt","(?<=_)S\\d+(?=_)")

Answer 3

使用spring.redis.host=localhost spring.redis.port=6379 软件包：

 spring.redis.cluster.max-redirects= # Maximum number of redirects to follow when executing commands across the cluster.
 spring.redis.cluster.nodes= # Comma-separated list of "host:port" pairs to bootstrap from.
 spring.redis.database=0 # Database index used by the connection factory.
 spring.redis.url= # Connection URL. Overrides host, port, and password. User is ignored. Example: redis://user:password@example.com:6379
 spring.redis.host=localhost # Redis server host.
 spring.redis.jedis.pool.max-active=8 # Maximum number of connections that can be allocated by the pool at a given time. Use a negative value for no limit.
 spring.redis.jedis.pool.max-idle=8 # Maximum number of "idle" connections in the pool. Use a negative value to indicate an unlimited number of idle connections.
 spring.redis.jedis.pool.max-wait=-1ms # Maximum amount of time a connection allocation should block before throwing an exception when the pool is exhausted. Use a negative      value to block indefinitely.
 spring.redis.jedis.pool.min-idle=0 # Target for the minimum number of idle connections to maintain in the pool. This setting only has an effect if it is positive.
 spring.redis.lettuce.pool.max-active=8 # Maximum number of connections that can be allocated by the pool at a given time. Use a negative value for no limit.
 spring.redis.lettuce.pool.max-idle=8 # Maximum number of "idle" connections in the pool. Use a negative value to indicate an unlimited number of idle connections.
 spring.redis.lettuce.pool.max-wait=-1ms # Maximum amount of time a connection allocation should block before throwing an exception when the pool is exhausted. Use a negative      value to block indefinitely.
 spring.redis.lettuce.pool.min-idle=0 # Target for the minimum number of idle connections to maintain in the pool. This setting only has an effect if it is positive.
 spring.redis.lettuce.shutdown-timeout=100ms # Shutdown timeout.
 spring.redis.password= # Login password of the redis server.
 spring.redis.port=6379 # Redis server port.
 spring.redis.sentinel.master= # Name of the Redis server.
 spring.redis.sentinel.nodes= # Comma-separated list of "host:port" pairs.
 spring.redis.ssl=false # Whether to enable SSL support.
 spring.redis.timeout= # Connection timeout.