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MySQL's regular expression matching has other special pattern elements as well. See Appendix C for more information.
Operator Precedence
When MySQL evaluates an expression, it looks at the operators to determine the order in which it should group the terms of the expression. Some operators have higher precedence; that is, they are "stronger" than others in the sense that they are evaluated earlier than others. For example, multiplication and division have higher precedence than addition and subtraction. The following two expressions are equivalent because * and / are evaluated before + and -:
1 + 2 * 3 - 4 / 5 6.2
1 + 6 - .8 6.2
Operator precedence is shown in the following list, from highest precedence to lowest. Operators listed on the same line have the same precedence. Operators at a higher precedence level are evaluated before operators at a lower precedence level. Operators at the same precedence level are evaluated left to right.
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