C#正则表达式的简单应用.

这个小例子的源码在http://download.csdn.net/source/1239641

 

using System;<br />using System.Collections.Generic;<br />using System.ComponentModel;<br />using System.Data;<br />using System.Drawing;<br />using System.Text;<br />using System.Windows.Forms;<br /><br />using System.Text.RegularExpressions;<br /><br />namespace _RegularExpression_<br />{<br /> public partial class RegularExpression : Form<br /> {<br /> public RegularExpression()<br /> {<br /> InitializeComponent();<br /><br /> // do initials<br /> comboBox1.Items.Add(@"--------------------------------------------------------------------------------------------------------");<br /> comboBox1.Items.Add(@"[\u4e00-\u9fa5]:匹配中文字符");<br /> comboBox1.Items.Add(@"[^\x00-\xff]:匹配双字节字符(包括汉字在内)");<br /> comboBox1.Items.Add(@"^[0-9]*[1-9][0-9]*$:匹配正整数");<br /> comboBox1.Items.Add(@"^((-\d+)|(0+))$:匹配非正整数（负整数 + 0）");<br /> comboBox1.Items.Add(@"^-?\d+$:匹配整数 ");<br /><br /> comboBox1.Items.Add(@"--------------------------------------------------------------------------------------------------------");<br /> //comboBox1.Items.Add(@"^(([0-9]+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*))$:匹配正浮点数");<br /> comboBox1.Items.Add(@"^\d+(\.\d+)?$:匹配非负浮点数（正浮点数 + 0） ");<br /> comboBox1.Items.Add(@"^(-?\d+)(\.\d+)?$:匹配浮点数");<br /> comboBox1.Items.Add(@"^[A-Za-z]+$:匹配英文字母组成的字符串");<br /> comboBox1.Items.Add(@"^[A-Z]+$:匹配英文字母大写字符串");<br /> comboBox1.Items.Add(@"^[a-z]+$:匹配由26个英文字母的小写组成的字符串");<br /><br /> comboBox1.Items.Add(@"--------------------------------------------------------------------------------------------------------");<br /> comboBox1.Items.Add(@"^[A-Za-z0-9]+$:匹配数字和英文字母组成的字符串");<br /> comboBox1.Items.Add(@"^\w+$:匹配由数字、26个英文字母或者下划线组成的字符串 ");<br /> comboBox1.Items.Add(@"^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$:匹配email地址");<br /> comboBox1.Items.Add(@"^[a-zA-z]+://匹配(\w+(-\w+)*)(\.(\w+(-\w+)*))*(\?\S*)?$:匹配url");<br /> comboBox1.Items.Add(@"^((\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.){3}(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])$:匹配IP");<br /><br /> comboBox1.Items.Add(@"--------------------------------------------------------------------------------------------------------");<br /> //set default selected index<br /> this.comboBox1.SelectedIndex = 0;<br /> }<br /> //验证button被点击的时候<br /> private void btnValidate_Click(object sender, EventArgs e)<br /> {<br /> //textBox2.Enabled =true;<br /> string strTest = comboBox1.Text.ToString().Trim();<br /> string[] strSplit = strTest.Split(':');<br /> //设置正则表达式<br /> Regex r = new Regex(strSplit[0]);<br /> //看是否匹配<br /> if (r.IsMatch(textBox2.Text.ToString().Trim()))<br /> {<br /> textBox3.Clear();<br /> textBox3.Text = "Mathed";<br /> }<br /> else<br /> {<br /> textBox3.Clear();<br /> textBox3.Text = "Not Math!";<br /> //textBox3.Clear();<br /> }<br /> }<br /><br /> private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)<br /> {<br /> if (comboBox1.Text == "--------------------------------------------------------------------------------------------------------"||<br /> this.comboBox1.SelectedIndex==-1)<br /> {<br /> // comboBox1.Text = "";<br /> textBox2.Enabled = false;<br /> btnValidate.Enabled = false;<br /> }<br /> else<br /> {<br /> textBox2.Enabled = true;<br /> btnValidate.Enabled = true;<br /> }<br /><br /><br /> }<br /> }<br />}