排除包含数字字符的行，仅位于行的开头

import re

def filter_lines(lines):
    filtered_lines = []
    pattern = re.compile(r'^[^0-9].*')
    
    for line in lines:
        if pattern.match(line):
            filtered_lines.append(line)
    
    return filtered_lines

# 示例输入
input_lines = [
    "This is a valid line",
    "123 This line starts with a number",
    "Another valid line",
    "456 Another line starting with a number",
    "Yet another valid line"
]

# 调用函数进行筛选
filtered_lines = filter_lines(input_lines)

# 输出结果
for line in filtered_lines:
    print(line)

This is a valid line
Another valid line
Yet another valid line