📅 最后修改于: 2020-11-29 05:59:52 🧑 作者: Mango
MariaDB通过REGEXP运算符提供基于正则表达式的匹配。
句法：
expression REGEXP pattern
expression：字符表达式，例如列或字段。
pattern：正则表达式匹配信息。模式可以是以下各项的组合：
| Value | Description |
|---|---|
| ^ | Matches the beginning of a string. if used with a match_parameter of ‘m’, it matches the start of a line anywhere within expression. |
| $ | Matches the end of a string. if used with a match_parameter of ‘m’, it matches the end of a line anywhere within expression. |
| * | Matches zero or more occurrences. |
| + | Matches one or more occurrences. |
| ? | Matches zero or one occurrence. |
| . | Matches any character except null. |
| | | Used like an “or” to specify more than one alternative. |
| [ ] | Used to specify a matching list where you are trying to match any one of the characters in the list. |
| [^ ] | Used to specify a nonmatching list where you are trying to match any character except for the ones in the list. |
| ( ) | Used to group expressions as a subexpression. |
| {m} | Matches m times. |
| {m,} | Matches at least m times. |
| {m,n} | Matches at least m times, but no more than n times. |
| \n | n is a number between 1 and 9. matches the nth subexpression found within ( ) before encountering \n. |
| [..] | Matches one collation element that can be more than one character. |
| [::] | Matches character classes. |
| [==] | Matches equivalence classes. |
| \d | Matches a digit character. |
| \d | Matches a non-digit character. |
| \w | Matches a word character. |
| \w | Matches a non-word character. |
| \s | Matches a whitespace character. |
| \s | Matches a non-whitespace character. |
| *? | Matches the preceding pattern zero or more occurrences. |
| +? | Matches the preceding pattern one or more occurrences. |
| ?? | Matches the preceding pattern zero or one occurrence. |
| {n}? | Matches the preceding pattern n times. |
| {n,}? | Matches the preceding pattern at least n times. |
| {n,m}? | Matches the preceding pattern at least n times, but not more than m times. |