C #-regular expressions, commonly used data parsing-happy Dragon Boat Festival,

C #-regular expressions, commonly used data parsing-happy Dragon Boat Festival,

The Dragon Boat Festival is just waiting for a few hours. I wish you a happy holiday.

Here we will share several common Regular Expression parsing data writing methods in C #, which are actually the Regex class. For the regular expression matching format, read the regular expression api documentation carefully, thank you.

Start:

1. query whether there is a string of "Order Number" Data

1 // matched object 2 var expl = "[{\" Order No. \ ": 2006, \" Price \ ": 888.90, \" order time \": \ "\", \ "payment status \": \ "paid \", \ "Payment time \"}, {\ "Order No. \": 2007, \ "Price \": 999.99, \ "order time \": \ "\", \ "payment status \": \ "paid \", \ "Payment time \": \ "\" },{ \ "Order No. \": 2008, \ "Price \": 999, \ "order time \": \ "\", \ "payment status \": \ "unpaid \", \ "Payment time \": \ "\"}] "; 3 4 // 1. query whether there is a string of "Order Number" data 5 var isExists = Regex. isMatch (expl, @ "price"); 6 Console. writeLine ("1. query whether there is a string of "Order Number" data "); 7 Console. writeLine (isExists );View Code

TIPS: The IsMatch method is used to determine whether a matching item exists. Simply enter the information to be searched in the method.

2. query a "price" (excluding decimal part)

1 // 2. query a "price" (excluding decimal part) 2 var m02 = Regex. match (expl, "\" Price \ ": \ d +"); 3 Console. writeLine ("\ n2. query a" price "(excluding decimal part)"); 4 Console. writeLine (m02.Value );View Code

TIPS: Match directly obtains the value of the matching item

3. query the "price" of an order (including the fractional part of the price)

1 // 3. query the "price" of an order (including the fractional part of the price) 2 var m03 = Regex. match (expl, "\" Price \ ": [^,] +"); 3 Console. writeLine ("\ n3. query the" price "of an order (including the fractional part of the price)"); 4 Console. writeLine (m03.Value );View Code

TIPS: use regular ^ to match data

4. query the "price" of all orders"

1 // 4. query all orders "price" 2 MatchCollection m04 = Regex. matches (expl, "\" Price \ ": [^,] +"); 3 Console. writeLine ("\ n4. query all order" Prices "); 4 foreach (Match m004 in m04) 5 {6 Console. writeLine (m004.Value); 7}View Code

TIPS: Matches obtains the matched set group.

5. query the "price" of all orders and output the price information

1 // 5. query all order "Prices" and output price information 2 MatchCollection m05 = Regex. Matches (expl, "\" Price \":(? <Price> [^,] +) "); 3 Console. writeLine ("\ n5. query all order" Prices ", output price information"); 4 foreach (Match m005 in m05) 5 {6 Console. writeLine (m005.Groups ["price"]. value); 7}View Code

Experience: use regular expressions (? <Price> xxxx) format to obtain the value of an item in the matching Group

6. query all order information and output information

1 // 6. query all order information and output information 2 MatchCollection m06 = Regex. Matches (expl, "\" Order No \":(? <Orderid> [^,] +), \ "Price \":(? <Price> [^,] +), \ "order time \":\"(? <Createtime> [^,] +) \ ", \" payment status \":\"(? <Paystatus> [^,] +) \ ""); 3 Console. writeLine ("\ n6. query all order information, output information"); 4 foreach (Match m006 in m06) 5 {6 7 8 Console. writeLine (@ "{0 }:{ 1 },{ 2 }:{ 3 },{ 4 }:{ 5 },{ 6 }:{ 7 }", 9 m006.Groups ["orderid"], m006.Groups ["orderid"]. value, 10 m006.Groups ["price"], m006.Groups ["price"]. value, 11 m006.Groups ["createtime"], m006.Groups ["createtime"]. value, 12 m006.Groups ["paystatus"], m006.Groups ["paystatus"]. value); 13}View Code

TIPS: Get the values of multiple items in the matching Group

7. Query "unpaid" order information

1 // 7. Query "unpaid" Order Information 2 MatchCollection m07 = Regex. Matches (expl, "\" Order No \":(? <Orderid> [^,] +), \ "Price \":(? <Price> [^,] +), \ "order time \":\"(? <Createtime> [^,] +) \ ", \" payment status \":\"(? <Paystatus> unpaid) \ ""); 3 Console. writeLine ("\ n7. query" unpaid "order information"); 4 foreach (Match m007 in m07) 5 {6 7 8 Console. writeLine (@ "{0 }:{ 1 },{ 2 }:{ 3 },{ 4 }:{ 5 },{ 6 }:{ 7 }", 9 m007.Groups ["orderid"], m007.Groups ["orderid"]. value, 10 m007.Groups ["price"], m007.Groups ["price"]. value, 11 m007.Groups ["createtime"], m007.Groups ["createtime"]. value, 12 m007.Groups ["paystatus"], m007.Groups ["paystatus"]. value); 13}View Code

TIPS: Set groups matching different conditions

8. case-insensitive matching results

1 // 8. case-insensitive matching result 2 var m08 = Regex. isMatch ("I love ZuGuo", "ZUGUO"); 3 Console. writeLine ("\ n8. case-insensitive matching result"); 4 Console. writeLine (m08 );View Code

TIPS: Regex is case sensitive by default.

9. Case Insensitive

1 // 9. ignore case 2 var m09 = Regex. isMatch ("I love ZuGuo", "ZUGUO", RegexOptions. ignoreCase); 3 Console. writeLine ("\ n9. case-insensitive"); 4 Console. writeLine (m09 );View Code

TIPS: Use RegexOptions to ignore case sensitivity

10. Match string information with spaces

1 // 10. match string information with spaces 2 var m10 = Regex. match ("happy", "[^ A] +"); 3 Console. writeLine ("\ n10. matching string information with spaces"); 4 Console. writeLine (m10.Value );View Code

Experience: Regular Expressions are really powerful. Haha

Code:

1 // C #-Regular Expression, commonly used data parsing-happy Dragon Boat Festival 2 3 // matching object 4 var expl = "[{\" Order No. \ ": 2006, \ "Price \": 888.90, \ "order time \": \ "\", \ "payment status \": \ "paid \", \ "Payment time \": \ "\" },{ \ "Order No. \": 2007, \ "Price \": 999.99, \ "order time \": \ "\", \ "payment status \": \ "paid \", \ "Payment time \"}, {\ "Order No. \": 2008, \ "Price \": 999, \ "order time \": \ "\", \ "payment status \": \ "unpaid \", \ "Payment time \": \ "\"}] "; 5 6 // 1. query whether the "Order Number" data string exists. 7 var isExists = Regex. IsMatch (expl, @ "price"); 8 Console. writeLine ("1. query whether there is a string of "Order Number" data "); 9 Console. writeLine (isExists); 10 11 // 2. query a "price" (excluding decimal part) 12 var m02 = Regex. match (expl, "\" Price \ ": \ d +"); 13 Console. writeLine ("\ n2. query a" price "(excluding decimal part)"); 14 Console. writeLine (m02.Value); 15 16 // 3. query the "price" of an order (including the fractional part of the price) 17 var m03 = Regex. match (expl, "\" Price \ ": [^,] +"); 18 Console. writeLine ("\ n3. query an order" price "(including the fractional part of the price)"); 19 Console. writeLine (m03. Value); 20 21 // 4. query all orders "price" 22 MatchCollection m04 = Regex. matches (expl, "\" Price \ ": [^,] +"); 23 Console. writeLine ("\ n4. query all order" Prices "); 24 foreach (Match m004 in m04) 25 {26 Console. writeLine (m004.Value); 27} 28 29 // 5. query all order "Prices" and output price information 30 MatchCollection m05 = Regex. matches (expl, "\" Price \":(? <Price> [^,] +) "); 31 Console. writeLine ("\ n5. query all order" Prices ", output price information"); 32 foreach (Match m005 in m05) 33 {34 Console. writeLine (m005.Groups ["price"]. value); 35} 36 37 // 6. query all order information, output information 38 MatchCollection m06 = Regex. matches (expl, "\" Order No \":(? <Orderid> [^,] +), \ "Price \":(? <Price> [^,] +), \ "order time \":\"(? <Createtime> [^,] +) \ ", \" payment status \":\"(? <Paystatus> [^,] +) \ ""); 39 Console. writeLine ("\ n6. query all order information, output information"); 40 foreach (Match m006 in m06) 41 {42 43 44 Console. writeLine (@ "{0 }:{ 1 },{ 2 }:{ 3 },{ 4 }:{ 5 },{ 6 }:{ 7 }", 45 m006.Groups ["orderid"], m006.Groups ["orderid"]. value, 46 m006.Groups ["price"], m006.Groups ["price"]. value, 47 m006.Groups ["createtime"], m006.Groups ["createtime"]. value, 48 m006.Groups ["paystatus"], m006.Groups ["paystatus"]. value); 49} 50 51 // 7. Query "unpaid" order information 52 MatchCollection m07 = Regex. Matches (expl, "\" Order No \":(? <Orderid> [^,] +), \ "Price \":(? <Price> [^,] +), \ "order time \":\"(? <Createtime> [^,] +) \ ", \" payment status \":\"(? <Paystatus> unpaid) \ ""); 53 Console. writeLine ("\ n7. query" unpaid "order information"); 54 foreach (Match m007 in m07) 55 {56 57 58 Console. writeLine (@ "{0 }:{ 1 },{ 2 }:{ 3 },{ 4 }:{ 5 },{ 6 }:{ 7 }", 59 m007.Groups ["orderid"], m007.Groups ["orderid"]. value, 60 m007.Groups ["price"], m007.Groups ["price"]. value, 61 m007.Groups ["createtime"], m007.Groups ["createtime"]. value, 62 m007.Groups ["paystatus"], m007.Groups ["paystatus"]. value); 63} 64 65 // 8. case-insensitive matching result 66 var m08 = Regex. isMatch ("I love ZuGuo", "ZUGUO"); 67 Console. writeLine ("\ n8. case-insensitive matching result"); 68 Console. writeLine (m08); 69 70 // 9. case-insensitive 71 var m09 = Regex. isMatch ("I love ZuGuo", "ZUGUO", RegexOptions. ignoreCase); 72 Console. writeLine ("\ n9. case-insensitive"); 73 Console. writeLine (m09); 74 75 // 10. match string information with spaces 76 var m10 = Regex. match ("happy", "[^ A] +"); 77 Console. writeLine ("\ n10. matching string information with spaces"); 78 Console. writeLine (m10.Value); 79 80 Console. readLine ();View Code

At this moment, the idea is: three-day holiday at the Dragon Boat Festival. It's really boring to be alone in the smog City in Beijing. Fortunately, dota1 is available. Come with friends, 11 (walking 3 x Ox)