In the output, we can see, the sub-string ‘robot’ is replaced as ‘Human; and updated string that is returned by the SELECT query is ‘I am Human. We can see, in the output that both the upper case ‘I ‘are replaced with lower case ‘i’. If there’s no match (i.e. A regular expression is a special string that describes a search pattern. It is used for pattern matching. Parameters. As mentioned, by default, all occurrences are replaced. REGEXP_REPLACE() operator is used in the SELECT query, to replace the matched sub-string. There are several characters in this argument. Notes. If omitted, it starts at position 1. If omitted, it starts at position 1. Generally, these patterns are used in String searching algorithms in order to perform find or find and replace operations on Strings, or for validating the input. This tutorial shows how to replace the characters in a string or text using regular expression in MySQL function. When using arrays with pattern and replacement, the keys are processed in the order they appear in the array.This is not necessarily the same as the numerical index order. This portion of string will update the sub-string ‘table’ with ‘*****’. MySQL supports another type of pattern matching operation based on the regular expressions and the REGEXP operator. The optional match_typeargument allows you to refine the regular expression… It compares the given pattern in the column and returns the items which are matching with the patterns. Here’s an example: In this case we start at position 1. REGEXP operator. set@original ='I am robot. MySQL only has one operator that allows you to work with regular expressions. If expr , pat, or repl is NULL, the return value is NULL . Note: . MySQL supports another type of pattern matching operation based on the regular expressions and the REGEXP operator. Remove special characters from a database field, For those you can combine Replace with the Char() function. Occurrence specifies which occurrence of the expression is to be replaced. We had sub-string ‘Table’ three times in the original string. The syntax goes like this: Where expr is the input string and pat is the regular expression pattern for the substring. In case you didn’t guess it already, 0 means that MySQL should return the first position of the match, while 1 means the position after the match. In the above query, all occurrences of the specified sub-strings, from a particular position, were replaced. We looked at wildcards in the previous tutorial. Hope this helps. This argument can also be omitted and instead, all occurrences will be replaced. The query is expected to return three cases: The output will have the case insensitive result field with ‘table’ replaced by ‘*****’. The syntax of the REPLACE function is as follows: REPLACE (str,old_string,new_string); The REPLACE function has three parameters. This is a guide to MySQL REGEXP_REPLACE(). The optional occurrenceargument allows you to specify which occurrence of the match to search for. -- 注replace(字段名,"需要替换的字符","替换的字符")，这样即可。 在Mysql中，replace和regexp主要是通过sql语句实现数据的替换。 我们先来说说replace 的具体用法。 mysql replace用法 . REGEXP is the operator used when performing regular expression pattern matches. You specify the matching pattern similar to how you do it with the LIKE operator: SELECT prodid, product WHERE product REGEXP 'apple'; In the regular expression, by default any text you enter is matched anywhere in the data field. Instead, let us see how we can replace only one occurrence of sub-string ‘Table’ from the original string. This is how I can get the rows... select id, description from table where description regexp '[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]'; The same query can give a different output if we change the position of occurrence count. SELECT@original,REGEXP_REPLACE(@original , 'Table', '*****', 2, 2); The Output will be updating the second occurrence of ‘Table’ from the second position. This operator searches for the regular expression identifies it, replaces the pattern with the sub-string provided explicitly in the query, and returns the output with the updated sub-string. The whole string is returned along with the replacements. If the pattern finds a match in the expression, the function returns 1, else it returns 0. 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