找出所有含tag的:[pdf] or [video], 不能直接用[pdf],要加\[pdf\]; 如果是single-word: '[\w+\]';如果含有space or punctuation: '\[.+]' In[1]:r'\w''\\w'In[2]:'\\w'\wIn[2]:print(r'\n')\nIn[3]:print('\n')#输出了看不见的换行符,而不是字符`\n` 6.Negative Character...
using System; using System.Text.RegularExpressions; public class Example { public static void Main() { // Get drives available on local computer and form into a single character expression. string[] drives = Environment.GetLogicalDrives(); string driveNames = String.Empty; foreach (string drive ...
using System; using System.Text.RegularExpressions; public class Example { public static void Main() { // Get drives available on local computer and form into a single character expression. string[] drives = Environment.GetLogicalDrives(); string driveNames = String.Empty; foreach (string drive ...
using System; using System.Text.RegularExpressions; public class Example { public static void Main() { // Get drives available on local computer and form into a single character expression. string[] drives = Environment.GetLogicalDrives(); string driveNames = String.Empty; foreach (string drive ...
using System; using System.Text.RegularExpressions; public class Example { public static void Main() { // Get drives available on local computer and form into a single character expression. string[] drives = Environment.GetLogicalDrives(); string driveNames = String.Empty; foreach (string drive ...
The replacement string, " ", replaces them with a single space character. C# Copy Run using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string input = "This is text with far too much " + "white space."; string pattern = "\\s+"...
matches any single character. It will not match return or newline characters. For example, the regular expression .ar means: any character, followed by the letter a, followed by the letter r. ".ar" => The car parked in the garage. Test the regular expression 2.2 Character Sets Character...
using System; using System.Text.RegularExpressions; public class Example { public static void Main() { // Get drives available on local computer and form into a single character expression. string[] drives = Environment.GetLogicalDrives(); string driveNames = String.Empty; foreach (string dri...
\ Escape character for special characters . Placeholder for any single character \d Placeholder for any single digit [] Definition of a value set for single characters [ - ] Definition of a range in a value set for single characters ? One or no single characters * Concatenation of any numbe...
These characters in a regular expression will do the following: -looks for a dash. [^ ]specifies a character set but because the first character inside the square brackets is a caret, this negates the set. In this case, the regular expression will match on anything that is not a s...