C#正則表達式的簡單應用.

這個小例子的源碼在http://download.csdn.net/source/1239641

 

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Text.RegularExpressions; namespace _RegularExpression_ { public partial class RegularExpression : Form { public RegularExpression() { InitializeComponent(); // do initials comboBox1.Items.Add(@"--------------------------------------------------------------------------------------------------------"); comboBox1.Items.Add(@"[/u4e00-/u9fa5]:匹配中文字符"); comboBox1.Items.Add(@"[^/x00-/xff]:匹配雙字節字符(包括漢字在內)"); comboBox1.Items.Add(@"^[0-9]*[1-9][0-9]*$:匹配正整數"); comboBox1.Items.Add(@"^((-/d+)|(0+))$:匹配非正整數（負整數 + 0）"); comboBox1.Items.Add(@"^-?/d+$:匹配整數 "); comboBox1.Items.Add(@"--------------------------------------------------------------------------------------------------------"); //comboBox1.Items.Add(@"^(([0-9]+/.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*/.[0-9]+)|([0-9]*[1-9][0-9]*))$:匹配正浮點數"); comboBox1.Items.Add(@"^/d+(/./d+)?$:匹配非負浮點數（正浮點數 + 0） "); comboBox1.Items.Add(@"^(-?/d+)(/./d+)?$:匹配浮點數"); comboBox1.Items.Add(@"^[A-Za-z]+$:匹配英文字母組成的字符串"); comboBox1.Items.Add(@"^[A-Z]+$:匹配英文字母大寫字符串"); comboBox1.Items.Add(@"^[a-z]+$:匹配由26個英文字母的小寫組成的字符串"); comboBox1.Items.Add(@"--------------------------------------------------------------------------------------------------------"); comboBox1.Items.Add(@"^[A-Za-z0-9]+$:匹配數字和英文字母組成的字符串"); comboBox1.Items.Add(@"^/w+$:匹配由數字、26個英文字母或者下劃線組成的字符串 "); comboBox1.Items.Add(@"^[/w-]+(/.[/w-]+)*@[/w-]+(/.[/w-]+)+$:匹配email地址"); comboBox1.Items.Add(@"^[a-zA-z]+://匹配(/w+(-/w+)*)(/.(/w+(-/w+)*))*(/?/S*)?$:匹配url"); comboBox1.Items.Add(@"^((/d{1,2}|1/d/d|2[0-4]/d|25[0-5])/.){3}(/d{1,2}|1/d/d|2[0-4]/d|25[0-5])$:匹配IP"); comboBox1.Items.Add(@"--------------------------------------------------------------------------------------------------------"); //set default selected index this.comboBox1.SelectedIndex = 0; } //驗證button被點擊的時候 private void btnValidate_Click(object sender, EventArgs e) { //textBox2.Enabled =true; string strTest = comboBox1.Text.ToString().Trim(); string[] strSplit = strTest.Split(':'); //設置正則表達式 Regex r = new Regex(strSplit[0]); //看是否匹配 if (r.IsMatch(textBox2.Text.ToString().Trim())) { textBox3.Clear(); textBox3.Text = "Mathed"; } else { textBox3.Clear(); textBox3.Text = "Not Math!"; //textBox3.Clear(); } } private void comboBox1_SelectedIndexChanged(object sender, EventArgs e) { if (comboBox1.Text == "--------------------------------------------------------------------------------------------------------"|| this.comboBox1.SelectedIndex==-1) { // comboBox1.Text = ""; textBox2.Enabled = false; btnValidate.Enabled = false; } else { textBox2.Enabled = true; btnValidate.Enabled = true; } } } }