C#使用正則表達(dá)式實現(xiàn)常見的格式驗證

更新時間：2024年01月30日 10:59:04 作者：wenchm

這篇文章主要為大家詳細(xì)介紹了C#如何使用正則表達(dá)式實現(xiàn)常見的格式驗證,例如：電話號碼、密碼、郵編等,感興趣的小伙伴可以跟隨小編一起學(xué)習(xí)一下

一、涉及到的知識點(diǎn)

Regex類的IsMatch方法用于指示正則表達(dá)式使用pattern參數(shù)中指定的正則表達(dá)式是否在輸入字符串中找到匹配項。語法格式如下：

public static bool IsMatch(string input,string patterm)

參數(shù)說明

Input：字符串對象，表示要搜索匹配項的字符串。

Pattern：字符串對象，表示要匹配的正則表達(dá)式模式。

Bool：返回布爾值，如果正則表達(dá)式找到匹配項，則返回值為true，否則返回值為false。

其中，正則表達(dá)式中匹配位置的元字符“^”。正則表達(dá)式中“^”用于匹配行首，如果正則表達(dá)式匹配以First開頭的行，則正則表達(dá)式如下：^First。

如果電話號碼的格式：xxx-xxxxxxxx，其中，x—代表數(shù)字，那么匹配的正則表達(dá)式是：^(\d{3,4}-)?\d{6,8}$。

如果密碼有a-z、A-Z、0-9組成，并且至少一個大小寫字母和數(shù)字，那么其正則表達(dá)式：[A-Za-z]+[0-9]；

如果密碼有a-z、A-Z、0-9組成，并且至少一個大小寫字母或數(shù)字，那么其正則表達(dá)式：[A-Za-z0-9]+，其中+有沒有都可以；

如果把正則表達(dá)式改為[A-Z]+[a-z]+[0-9]，就變成依次至少一個大寫、一個小寫、一個數(shù)字了，打亂了順序都不行。

由6位數(shù)字組成的郵編的正則表達(dá)式：^\d{6}$；

二、實例1：驗證電話號碼的格式

//使用正則表達(dá)式驗證電話號碼
namespace _070
{
    public partial class Form1 : Form
    {
        private Label? label1;
        private Label? label2;
        private Label? label3;
        private Button? button1;
        private TextBox? textBox1;
        public Form1()
        {
            InitializeComponent();
            Load += Form1_Load;
        }
        private void Form1_Load(object? sender, EventArgs e)
        {
            // 
            // label1
            // 
            label1 = new Label
            {
                AutoSize = true,
                Location = new Point(36, 22),
                Name = "label1",
                Size = new Size(68, 17),
                TabIndex = 0,
                Text = "輸入號碼："
            };
            // 
            // label2
            //        
            label2 = new Label
            {
                AutoSize = true,
                Location = new Point(156, 49),
                Name = "label2",
                Size = new Size(79, 17),
                TabIndex = 1,
                Text = "xxx-xxxxxxxx"
            };
            // 
            // label3
            //          
            label3 = new Label
            {
                AutoSize = true,
                Location = new Point(36, 49),
                Name = "label3",
                Size = new Size(68, 17),
                TabIndex = 2,
                Text = "號碼格式："
            };
            // 
            // button1
            //         
            button1 = new Button
            {
                Location = new Point(160, 76),
                Name = "button1",
                Size = new Size(75, 23),
                TabIndex = 3,
                Text = "號碼驗證",
                UseVisualStyleBackColor = true
            };
            button1.Click += Button1_Click;
            // 
            // textBox1
            // 
            textBox1 = new TextBox
            {
                Location = new Point(115, 16),
                Name = "textBox1",
                Size = new Size(120, 23),
                TabIndex = 4
            };
            // 
            // Form1
            // 
            AutoScaleDimensions = new SizeF(7F, 17F);
            AutoScaleMode = AutoScaleMode.Font;
            ClientSize = new Size(294, 111);
            Controls.Add(textBox1);
            Controls.Add(button1);
            Controls.Add(label3);
            Controls.Add(label2);
            Controls.Add(label1);
            Name = "Form1";
            StartPosition = FormStartPosition.CenterScreen;
            Text = "使用正則表達(dá)式驗證電話號碼";
          
        }
        /// <summary>
        /// 驗證電話號碼格式是否正確
        /// </summary>
        private void Button1_Click(object? sender, EventArgs e)
        {
            if (!IsTelephone(textBox1!.Text))
            { 
                MessageBox.Show("電話號碼格式不正確"); 
            }
            else 
            { 
                MessageBox.Show("電話號碼格式正確"); 
            }
        }
 
        /// <summary>
        /// 驗證電話號碼格式是否匹配
        /// </summary>
        /// <param name="str_telephone">電話號碼信息</param>
        /// <returns>方法返回布爾值</returns>
        public static bool IsTelephone(string str_telephone)
        {
            return MyRegex().IsMatch(str_telephone);
        }
 
        [System.Text.RegularExpressions.GeneratedRegex(@"^(\d{3,4}-)?\d{6,8}$")]
        private static partial System.Text.RegularExpressions.Regex MyRegex();
    }
}

三、實例2：驗證密碼的格式

// 使用正則表達(dá)式驗證密碼格式
namespace _071
{
    public partial class Form1 : Form
    {
        private GroupBox? groupBox1;
        private Button? button1;
        private TextBox? textBox1;
        private Label? label1;
 
        public Form1()
        {
            InitializeComponent();
            Load += Form1_Load;
        }
        private void Form1_Load(object? sender, EventArgs e)
        {
            // 
            // button1
            // 
            button1 = new Button
            {
                Location = new Point(171, 58),
                Name = "button1",
                Size = new Size(100, 23),
                TabIndex = 2,
                Text = "驗證密碼格式",
                UseVisualStyleBackColor = true
            };
            button1.Click += Button1_Click;
            // 
            // textBox1
            // 
 
            textBox1 = new TextBox
            {
                Location = new Point(126, 24),
                Name = "textBox1",
                Size = new Size(145, 23),
                TabIndex = 1
            };
            // 
            // label1
            //
 
            label1 = new Label
            {
                AutoSize = true,
                Location = new Point(35, 30),
                Name = "label1",
                Size = new Size(68, 17),
                TabIndex = 0,
                Text = "輸入密碼："
            };
            // 
            // groupBox1
            // 
            groupBox1 = new GroupBox
            {
                Location = new Point(12, 12),
                Name = "groupBox1",
                Size = new Size(307, 87),
                TabIndex = 0,
                TabStop = false,
                Text = "密碼必須由數(shù)字和大小寫字母組成"
            };
            groupBox1.Controls.Add(button1);
            groupBox1.Controls.Add(textBox1);
            groupBox1.Controls.Add(label1);
            groupBox1.SuspendLayout();
 
            // 
            // Form1
            // 
            AutoScaleDimensions = new SizeF(7F, 17F);
            AutoScaleMode = AutoScaleMode.Font;
            ClientSize = new Size(331, 111);
            Controls.Add(groupBox1);
            Name = "Form1";
            StartPosition = FormStartPosition.CenterScreen;
            Text = "正則表達(dá)式驗證密碼格式";
            groupBox1.ResumeLayout(false);
            groupBox1.PerformLayout();
        }
 
        private void Button1_Click(object? sender, EventArgs e)
        {
            if (!IsPassword(textBox1!.Text.Trim()))
            { 
                MessageBox.Show("密碼格式不正確!!!"); 
            }
            else
            {
                MessageBox.Show("密碼格式正確!!!!!");
            }
        }
        /// <summary>
        /// 驗證碼碼輸入條件
        /// </summary>
        /// <param name="str_password">密碼字符串</param>
        /// <returns>返回布爾值</returns>
        public static bool IsPassword(string str_password)
        {
            return MyRegex().IsMatch(str_password);
        }
 
        [System.Text.RegularExpressions.GeneratedRegex(@"[A-Za-z]+[0-9]")]//至少有一個字母，至少有一個數(shù)字
        //[System.Text.RegularExpressions.GeneratedRegex(@"[A-Z]+[a-z]+[0-9]")]//依次至少有一個大寫一個小寫一個
        //[System.Text.RegularExpressions.GeneratedRegex(@"[A-Za-z0-9]+")]//至少一個
        private static partial System.Text.RegularExpressions.Regex MyRegex();
    }
}

四、實例3：驗證郵編的格式

// 用正則表達(dá)式驗證郵編合法性
namespace _072
{
    public partial class Form1 : Form
    {
        private GroupBox? groupBox1;
        private TextBox? textBox1;
        private Button? button1;
        private Label? label1;
 
        public Form1()
        {
            InitializeComponent();
            Load += Form1_Load;
        }
        private void Form1_Load(object? sender, EventArgs e)
        {
            // 
            // textBox1
            // 
            textBox1 = new TextBox
            {
                Location = new Point(139, 32),
                Name = "textBox1",
                Size = new Size(100, 23),
                TabIndex = 2
            };
            // 
            // button1
            // 
            button1 = new Button
            {
                Location = new Point(139, 61),
                Name = "button1",
                Size = new Size(100, 23),
                TabIndex = 1,
                Text = "驗證郵編",
                UseVisualStyleBackColor = true
            };
            button1.Click += Button1_Click;
            // 
            // label1
            // 
            label1 = new Label
            {
                AutoSize = true,
                Location = new Point(55, 35),
                Name = "label1",
                Size = new Size(68, 17),
                TabIndex = 0,
                Text = "輸入郵編："
            };
            // 
            // groupBox1
            // 
            groupBox1 = new GroupBox
            {
                Location = new Point(12, 12),
                Name = "groupBox1",
                Size = new Size(280, 98),
                TabIndex = 0,
                TabStop = false,
                Text = "驗證郵編格式："
            };
            groupBox1.Controls.Add(textBox1);
            groupBox1.Controls.Add(button1);
            groupBox1.Controls.Add(label1);
            groupBox1.SuspendLayout();
            // 
            // Form1
            // 
            AutoScaleDimensions = new SizeF(7F, 17F);
            AutoScaleMode = AutoScaleMode.Font;
            ClientSize = new Size(304, 122);
            Controls.Add(groupBox1);
            Name = "Form1";
            StartPosition = FormStartPosition.CenterScreen;
            Text = "驗證郵編格式合法性";
            groupBox1.ResumeLayout(false);
            groupBox1.PerformLayout();
        }
 
        private void Button1_Click(object? sender, EventArgs e)
        {
            if (!IsPostalcode(textBox1!.Text))
            { 
                MessageBox.Show("郵政編號不正確!!!"); 
            }
            else 
            {
                MessageBox.Show("郵政編號正確!!!!!"); 
            }
        }
        /// <summary>
        /// 驗證郵編格式是否正確
        /// </summary>
        /// <param name="str_postalcode">郵編字符串</param>
        /// <returns>返回布爾值</returns>
        public static bool IsPostalcode(string str_postalcode)
        {
            return MyRegex().IsMatch(str_postalcode);
        }
 
        [System.Text.RegularExpressions.GeneratedRegex(@"^\d{6}$")]
        private static partial System.Text.RegularExpressions.Regex MyRegex();
    }
}