In this post, we will learn How to do a regular expression replacement in MySQL Where regexp replaces () is used to replace a pattern in a string with another string using a regular expression which we will see as an example here.
Regular Expression Replacement
For replacing a pattern in a string with another string using regular expressions. The syntax of the function is as follows where we have given a line of code to execute which we can use directly:
REGEXP_ REPLACE( string, pattern, replacement [, start [, occurrence [, match_ type]]])
For explanations of each and every expression look at the explanations given below.
- String: the string to search for the pattern
- Pattern: the regular expression pattern to match
- Replacements: the string to replace the matched pattern
- Strat( which is also optional): the position in the string to start the search
- Occurrence ( also optional): the occurrence of the pattern to replace (default is all occurrences)
- Match ( also optional): the matching type (default is global)
WE have taken an example to replace all the occurrences of a particular expression completely by just one place or only executing a single line of code instead of making changes every everywhere by executing some operations every time:
SELECT REGEXP_ REPLACE('Hello World', 'o', 'X');
Here it will make HellX WXrld as all the ‘o’ are replaced by ‘x’ as per the code given above we have replaced all the expressions by some string in the String.
We can also optimize or customize the replacements as per our choice and make changes as per our choice where we want to make changes where ever we want and we can limit the number of replacements where we have options so for the same we have taken another example.
Where we have given some restrictions to replacements in the regular expression
SELECT REGEXP_ REPLACE(' Hello World', 'o', 'X', 1, 2);
This query returns the string “Hello WXrld”, where only the second occurrence of the letter “o” has been replaced with “X”.
Note that the Regular expression is the function that is only available in the latest versions of MySQL 8.0 and later versions. If you are using an earlier version of MySQL, you can use the Regular expression function provided by the udf reg express user-defined function library.
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