The regular test query tool can not only query some common regular expressions such as numbers, letters, email formats, etc. that are often used in program or form development, but also can simply test and compare the correctness of regular expressions on the page.
How to use:
1. Enter the name of the character type that needs to be searched in the text box of "Find Regular".
2. If you need to verify the test regular, you can enter the characters that need to be verified in the first text box of the verification rule, and enter the regular expression /^.../ in the second text box.
The meaning of symbols in some of the more commonly used regular expressions.
/ delimiter, enclose regular expressions between backslashes
^ matches the starting position of the string
$ matches the end position
* matches the preceding subexpression 0 or more times
. matches any single string, except \n
\ metacharacter as a normal character, representing a quote character
| "or" in comparison operations
[ ] matches any single character in parentheses
{i} or {i,j} can match a specified number of characters
? matches 0 or 1 previous character
+ matches 1 or more preceding characters
match start\<and match end\>
\n matches newline
\r matches carriage return
[a-z] matches any lowercase character in the range a~z.