Below is a JS regular expression that must contain numbers, letters, and special characters
js regular expression requirements:
1. Must contain numbers, English letters, special symbols and greater than or equal to 8 digits
2. Special symbols include:~!@#$%^&*
The regular expression is as follows:
/^(?=.*\d)(?=.*[a-zA-Z])(?=.*[~!@#$%^&*])[\da-zA-Z~!@#$%^&*]{8,}$/
explain:
Here we mainly use forward look in js regular tables ?=, for example
/\d/.exec( 'abc2abc' ) The matching result is 2, meaning: match a number
/\d(?=a)/.exec( 'abc2abc' ) The matching result is 2, meaning: match a number, but this number must be followed by the letter a
/\d(?=a)/.exec( 'abc2bc' ) The matching result is null
From this we can see that the ?= match result does not contain the characters it matches, but the string to be matched must comply with its corresponding rules.
When there are multiple forward-looking rules, they are parallel, not serial, e.g.
/\d(?=a)(?=b)/.exec( 'abc2abc' ) The matching result is null. If you want to match a number, you must follow the letters a and b to write this way.
/\d(?=a)(?=.b)/.exec( 'abc2abc' )，Of course this is to demonstrate its rules, but it can be written like this/\d(?=ab)/.exec( 'abc2abc' )
for/^(?=.*\d)(?=.*[a-zA-Z])(?=.*[~!@#$%^&*])[\da-zA-Z~!@#$%^&*]{8,}$/
In fact, the entire regular representation can be divided into three parts:
/^(?=.*\d)[\da-zA-Z~!@#$%^&*]{8,}$/
/^(?=.*[a-zA-Z])[\da-zA-Z~!@#$%^&*]{8,}$/
/^(?=.*[~!@#$%^&*])[\da-zA-Z~!@#$%^&*]{8,}$/
The string to be matched must meet these three parts at the same time.
Knowledge point expansion:
js regular expression matches special characters except Chinese characters, letters, numbers, commas, and periods (used to standardize input content)
/[^\u4e00-\u9fa5a-zA-Z\d,\.，。]+/
Where \u4e00-\u9fa5 matches Chinese characters, a-zA-Z matches letters, and \d matches numbers,,.,. Match commas and periods, ^ means non, + means as many matches as possible.
Summarize
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