import pandas as pd


def contains_code(crs_codes, code_list):
    codes = str(crs_codes).split(';')
    return any(code in code_list for code in codes)

def filter_projects(df, crs3_list):
    filtered_crs_df = df[df['crs_3_code'].apply(lambda x: contains_code(x, crs3_list))]

    return filtered_crs_df