Remove specific strings from entire pandas dataframe

I have a df:

Extract the string in one column when matches with another string list to make a new column

I have a dataframe:
| A_1 |
| ——– |
| AB546 GTY |
| BYU345 456 |
| AB546 HYT |
| BYU345 BWER |

Searching string and return value and other operationsbetween several datasets pandas

I have 4 data frames for example
Dm=