HOW to search for a string in a colomn in pandas code example

Example 1: dataframe column contains string

df[df['A'].str.contains("hello")]

Example 2: panda search strings in column

df[df['A'].str.contains("hello")]

Example 3: panda search strings in column

# find rows in `df1` which contain "foo" followed by something
df1[df1['col'].str.contains(r'foo(?!$)')]

      col
1  foobar