The default behavior is to match line terminators only at the start and end of the string expression. Recognize line terminators within the string. The match_type argument can contain the following characters: c Case sensitive matching. | Cat Dog Cat Dog Cat | Cat Dog Cat Dog Cat | Tiger Dog Tiger Dog Tiger | | Original String | Case-Sensitive | Case-Insensitive | Here’s an example of specifying a case-sensitive match and a case-insensitive match: SET = 'Cat Dog Cat Dog 'Original 'cat', 'Tiger', 1, 0, 'c') 'cat', 'Tiger', 1, 0, 'i') 'Case-Insensitive' This allows you to specify things like whether or not the match is case-sensitive, whether or not to include line terminators, etc. You can provide an additional argument to determine the match type. Here’s an example of explicitly specifying all occurrences: SET = 'Cat Dog Cat Dog 'Original 'Cat', 'Tiger', 1, 0) 'Result' In other words, if you omit this argument, all occurrences are replaced (as we’ve seen in the previous examples). The default value for the occurrence argument is 0, which means all occurrences are replaced. Therefore, occurrence 2 became occurrence 1, and occurrence 3 became occurrence 2. This happened because our starting position came after the first occurrence had started. | Cat Dog Cat Dog Cat | Cat Dog Cat Dog Tiger | However, if we start at a different position, the result is different: SET = 'Cat Dog Cat Dog 'Original 'Cat', 'Tiger', 2, 2) 'Result' | Cat Dog Cat Dog Cat | Cat Dog Tiger Dog Cat | Here’s an example: SET = 'Cat Dog Cat Dog 'Original 'Cat', 'Tiger', 1, 2) 'Result' However, you also have the option of specifying a specific occurrence to replace by using the occurrence argument. Example 5 – The occurrence ArgumentĪs mentioned, by default, all occurrences are replaced. We started at position 2, which comes after the start of the first occurrence, so the replace operation only affects those occurrences that come after the first one. | Cat Dog Cat Dog Cat | Cat Dog Tiger Dog Tiger | Here’s an example of specifying the starting position: SET = 'Cat Dog Cat Dog 'Original 'Cat', 'Tiger', 2) 'Result' There’s no match, so the string is returned unchanged. | Cat Dog Cat Dog Cat | Cat Dog Cat Dog Cat | Here’s an example where there’s no match: SET = 'Cat Dog Cat Dog 'Original 'Cow', 'Tiger') 'Result' However, you also have the option of specifying which occurrence you’d like to replace (more on this later). | Cat Dog Cat Dog Cat | Tiger Dog Tiger Dog Tiger | Example 2 – Multiple Matchesīy default, if there are multiple matches within the string, all of them are replaced: SET = 'Cat Dog Cat Dog 'Original 'Cat', 'Tiger') 'Result' In this case there’s a match, and the string is returned with the modification. Here’s a basic example: SET = 'It was 'Original 'good', 'great!') 'Result' For example, you can use this argument to specify case-sensitive matching or not. This allows you to refine the regular expression.
#Mysql regex replace how to
The optional match_type argument is a string that specifies how to perform matching. If omitted, all occurrences are replaced. The optional occurrence argument allows you to specify which occurrence of the match to search for. The optional pos argument allows you to specify a position within the string to start the search. The repl argument is the replacement string. Where expr is the input string and pat is the regular expression pattern for the substring.
The syntax goes like this: REGEXP_REPLACE(expr, pat, repl]]) the input string doesn’t contain the substring), the the whole string is returned unchanged. The whole string is returned along with the replacements. In MySQL, the REGEXP_REPLACE() function replaces occurrences of the substring within a string that matches the given regular expression pattern.
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