Select a value from Dataframe

[mfkzolo]

Hi,

How do I select a value from a column in my df, a value that start with a character, small or capital followed by numbers.

This is my code

search = ["S", "s"]

bool_series = df["UserName"].str.startswith(tuple(search), na = False)
df = results[bool_series]

So I want a value that starts with S or s then followed by any numbers. E.g I don't want S98OS1, but S78345

[aajkaal]

df['un_part'] = df.UserName.str[1:]
df = df[df.un_part.str.isnumeric()]

[puneethr12]

try below code:
df = pd.DataFrame({"username":["s123","s123a","abcd","efg","S345"]})
result = df["username"].str.match(r"^s\d+$", case=False)