How to realize the function of matching and replacing regular expressions
This article mainly introduces the regular expression how to achieve matching and replacement function, the article is very detailed, has a certain reference value, interested friends must read!
Regular expression, also known as regular expression. (English: RegularExpression, often abbreviated as regex, regexp or RE in code), a concept in computer science. Regular expressions are often used to retrieve and replace text that conforms to a certain pattern (rule).
Regular expressions match and replace
Input: publicExtension:IExt
Purpose: to match the middle classname and replace it
Expression:
Code:
PrivatestringReplace (stringinput)
{
ReturnRegex.Replace (input,@ "", newMatchEvaluator (RefineCodeTag), RegexOptions.Singleline)
}
StringRefineCodeTag (Matchm)
{
Stringx=m.ToString ()
X=Regex.Replace (x, ",")
Returnx.Trim () + ","
}
Screenshot:
two
Regular expression option RegexOptions:
ExplicitCapture
N
Only groups that are named or numbered are captured
IgnoreCase I is not case sensitive
IgnorePatternWhitespace x eliminates non-escaped whitespace in mode and enables comments marked by #.
MultiLine m
Multiline mode, which works by modifying the meaning of ^ and $
SingleLine s
Single-line mode, corresponding to MultiLine
Other features replaced by regular expressions:
$number replaces the matching number group with a replacement expression
This code returns "010120305"
That is to say, each matching result of group 1 is replaced by the expression "0 $1", and the "$1" in "0 $1" is replaced by the matching result of group 1.
PublicstaticvoidMain ()
{
Strings= "11235"
S=Regex.Replace (s=Regex.Replace @ "(\ d +) (? # this is a comment)," 0 $1 ", RegexOptions.Compiled | RegexOptions.IgnoreCase)
Console.WriteLine (s)
Console.ReadLine ()
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