In MySQL, the REGEXP_REPLACE() function replaces occurrences of the substring within a string that matches the given regular expression pattern.
The whole string is returned along with the replacements.
If there’s no match (i.e. the input string doesn’t contain the substring), the the whole string is returned unchanged.
In MySQL, the REGEXP_INSTR() function returns the starting index of a substring that matches the regular expression pattern.
The index starts at 1. If there’s no match, the result is 0.
In MySQL, the REGEXP_SUBSTR() function returns the substring that matches the given regular expression pattern.
If there’s no match (i.e. the input string doesn’t contain the substring), the result is NULL.
In MySQL, the RLIKE operator is used to determine whether or not a string matches a regular expression. It’s a synonym for REGEXP_LIKE().
If the string matches the regular expression provided, the result is 1, otherwise it’s 0.
In MySQL, the REGEXP operator is used to determine whether or not a string matches a regular expression. It’s a synonym for REGEXP_LIKE().
If the string matches the regular expression provided, the result is 1, otherwise it’s 0.
In MySQL, the REGEXP_LIKE() function is used to determine whether or not a string matches a regular expression.
The function returns 1 if the string matches the regular expression provided, and 0 if it doesn’t.
In MySQL, the WEIGHT_STRING() function returns the weight string for the input string. The return value is a binary string that represents the comparison and sorting value of the string.
If the input string is a nonbinary value, the return value contains the collation weights for the string. If it’s a binary value, the result is the same as the input string. This is because the weight for each byte in a binary string is the byte value.
This function is a debugging function intended for internal use. It can be used for testing and debugging of collations. Note that its behavior can change between MySQL versions.
In MySQL, the UNHEX() function allows you to “unhex” a string in MySQL. In other words, it allows you to convert a hexadecimal value to a human-readable string.
Specifically, the function interprets each pair of characters in the argument as a hexadecimal number and converts it to the byte represented by the number. The return value is a binary string.