shell 判断字符串是否包含

• =~ 判断字符串是否被包含(区分大小写)

  v='Hello World'
  
  [[ $v =~ 'hello' ]] && echo 'Y' || echo 'N'
  [[ $v =~ 'Hello' ]] && echo 'Y' || echo 'N'
  [[ $v =~ 'World' ]] && echo 'Y' || echo 'N'
  [[ $v =~ 'test' ]] && echo 'Y' || echo 'N'
  
  # N
  # Y
  # Y
  # N
  

• 正则通配符 *

  v='Hello World'
  
  [[ $v == *'hello'* ]] && echo 'Y' || echo 'N'
  [[ $v == *'Hello'* ]] && echo 'Y' || echo 'N'
  [[ $v == *'World'* ]] && echo 'Y' || echo 'N'
  [[ $v == *'test'* ]] && echo 'Y' || echo 'N'
  
  # N
  # Y
  # Y
  # N