python想要统计单个Go语言文件的类/属性/方法数量，但是为何只统计到1个方法？

想要统计.go文件内的类、属性、方法的数量：

import re

def count_go_elements(file_path):
    with open(file_path, 'r') as file:
        content = file.read()

        # 统计结构体
        struct_pattern = re.compile(r'type\s+(\w+)\s+struct')
        struct_names = struct_pattern.findall(content)
        struct_count = len(set(struct_names))  # 使用集合去重

        # 统计字段
        field_pattern = re.compile(r'(\w+)\s+(\w+)')
        fields = field_pattern.findall(content)
        field_count = len(fields)

        # 统计方法
        method_pattern = re.compile(r'func\s+\((.*?)\)\s+(\w+)\s*\((.*?)\)\s*{')
        methods = method_pattern.findall(content)
        method_count = len(methods)

    return struct_count, field_count, method_count

# 指定要统计的 Go 语言文件路径
file_path = '/Users/github_repos/kubernetes/pkg/kubelet/config/file_linux.go'

struct_count, field_count, method_count = count_go_elements(file_path)
print(f'结构体数量: {struct_count}')
print(f'字段数量: {field_count}')
print(f'方法数量: {method_count}')

执行结果为：

结构体数量: 1
字段数量: 121
方法数量: 1

go文件代码如下：可以看到里面不止1个func方法：

package config

import (
    "fmt"
    "os"
    "path/filepath"
    "strings"
    "time"

    "github.com/fsnotify/fsnotify"
    "k8s.io/klog/v2"

    "k8s.io/api/core/v1"
    "k8s.io/apimachinery/pkg/util/wait"
    "k8s.io/client-go/util/flowcontrol"
    kubetypes "k8s.io/kubernetes/pkg/kubelet/types"
)

const (
    retryPeriod    = 1 * time.Second
    maxRetryPeriod = 20 * time.Second
)

type retryableError struct {
    message string
}

func (e *retryableError) Error() string {
    return e.message
}

func (s *sourceFile) startWatch() {
}

func (s *sourceFile) doWatch() error {
}

func (s *sourceFile) produceWatchEvent(e *fsnotify.Event) error {
}

func (s *sourceFile) consumeWatchEvent(e *watchEvent) error {
    switch e.eventType {
    case podAdd, podModify:
        pod, err := s.extractFromFile(e.fileName)
        if err != nil {
            return fmt.Errorf("can't process config file %q: %v", e.fileName, err)
        }
        return s.store.Add(pod)
    case podDelete:
        if objKey, keyExist := s.fileKeyMapping[e.fileName]; keyExist {
            pod, podExist, err := s.store.GetByKey(objKey)
            if err != nil {
                return err
            }
            if !podExist {
                return fmt.Errorf("the pod with key %s doesn't exist in cache", objKey)
            }
            if err = s.store.Delete(pod); err != nil {
                return fmt.Errorf("failed to remove deleted pod from cache: %v", err)
            }
            delete(s.fileKeyMapping, e.fileName)
        }
    }
    return nil
}

请问这个正则匹配是哪里的问题啊？

method_pattern = re.compile(r'func\s+\((.*?)\)\s+(\w+)\s*\((.*?)\)\s*{')