scala字符串替換

Scala | 替換字符串中的正則表達式模式 (Scala | Replacing a regular expression pattern in a string)

Replacing a part of the string that matches our given regular expression can be done using multiple methods.

可以使用多種方法替換匹配給定正則表達式的字符串部分 。

As strings are immutable you cannot replace the pattern in the string itself instead, we will be creating a new string that stores the updated string.

由于字符串是不可變的，因此您不能替換字符串本身中的模式，我們將創(chuàng)建一個新字符串來存儲更新后的字符串。

1)replaceAll()方法 (1) replaceAll() Method)

The method replaces all the occurrences of the pattern matched in the string.

該方法替換字符串中所有匹配的模式。

Syntax:

句法：

string.replaceAll("regex", "replaceString")

Program to replace regular expression pattern in a string using replaceAll()

程序使用replaceAll()替換字符串中的正則表達式模式

object MyClass {def main(args: Array[String]) {val myString = "i can ride at a speed of 190 KmpH"println("The string is '" + myString + "'")println("Replacing all digits of the string with '*'")val updatedString = myString.replaceAll("[0-9]+", "*")println("Updated string is' " + updatedString + "'")} }

Output

輸出量

The string is 'i can ride at a speed of 190 KmpH' Replacing all digits of the string with '*' Updated string is' i can ride at a speed of * KmpH'

2)replaceAllIn()方法 (2) replaceAllIn() Method)

The method does the same work as replaceAll() but has a different syntax.

該方法的功能與replaceAll()相同，但是語法不同。

Syntax:

句法：

regex.replaceAllIn("String", "replacestring")

The function also returns an updated string with the matched pattern changed with the given replacestring.

該函數(shù)還返回一個更新的字符串，其中匹配的模式已更改為給定的replacestring 。

Program to replace regular expression pattern in a string using replaceAllIn()

程序使用replaceAllIn()替換字符串中的正則表達式模式

object MyClass {def main(args: Array[String]) {val myString = "I can ride At the Speed of 190 KmpH"val pattern = "[A-Z]".rprintln("The string is '" + myString + "'")println("Replacing all uppercase characters of the string with '*'")val updatedString = pattern.replaceAllIn(myString, "*")println("Updated string is '" + updatedString + "'")} }

Output

輸出量

The string is 'I can ride At the Speed of 190 KmpH' Replacing all uppercase characters of the string with '*' Updated string is '* can ride *t the *peed of 190 *mp*'

3)replaceFirst()方法 (3) replaceFirst() Method)

The replaceFirst() method will replace the match pattern in the string but only at its first occurrence i.e. the match pattern will be replaced only at its first occurrence.

replaceFirst()方法將替換字符串中的匹配模式，但僅在其首次出現(xiàn)時進行替換，即，匹配模式將僅在其首次出現(xiàn)時進行替換。

Syntax:

句法：

string.replaceFirst("regex", "replaceString")

The function will return an updated string with the first matched pattern replaced with the given replace string.

該函數(shù)將返回一個更新的字符串，其中第一個匹配的模式將替換為給定的替換字符串。

Program to replace regular expression pattern in a string using replaceFirst()

程序使用replaceFirst()替換字符串中的正則表達式模式

object MyClass {def main(args: Array[String]) {val myString = "i can ride at a speed of 190 KmpH"println("The string is '" + myString + "'")println("Replacing first digits of the string with '*'")val updatedString = myString.replaceFirst("[0-9]", "*")println("Updated string is '" + updatedString + "'")} }

Output

輸出量

The string is 'i can ride at a speed of 190 KmpH' Replacing first digits of the string with '*' Updated string is 'i can ride at a speed of *90 KmpH'

4)replaceFirstIn()方法 (4) replaceFirstIn() Method)

The replaceFirstIn() method will replace the match pattern in the string but only at its first occurrence i.e. the match pattern will be replaced only at its first occurrence.

replaceFirstIn()方法將替換字符串中的匹配模式，但僅在其首次出現(xiàn)時進行替換，即，匹配模式將僅在其首次出現(xiàn)時進行替換。

The only difference is the syntax.

唯一的區(qū)別是語法。

Syntax:

句法：

regex.replaceFirstIn("string", "replaceString")

Program to replace regular expression pattern in a string using replaceFirstIn()

程序使用replaceFirstIn()替換字符串中的正則表達式模式

object MyClass {def main(args: Array[String]) {val myString = "I can ride At the Speed of 190 KmpH"val pattern = "[A-Z]".rprintln("The string is '" + myString + "'")println("Replacing first occurence of uppercase characters of the string with '*'")val updatedString = pattern.replaceFirstIn(myString, "*")println("Updated string is '" + updatedString + "'")} }

Output

輸出量

The string is 'I can ride At the Speed of 190 KmpH' Replacing first occurence of uppercase characters of the string with '*' Updated string is '* can ride At the Speed of 190 KmpH'

翻譯自: https://www.includehelp.com/scala/how-to-replace-a-regular-expression-pattern-in-a-string-in-scala.aspx

scala字符串替換

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