JS Regular expression (i)

Regular expressions commonly used symbols

/..../begins to end

^ Start $ end

/s any non-null character/non-null

/d matches a number =[0-9]

/d matches a non-digital =[^0-9]

/w matches a number, underscore, alphabetic character =[a-z A-Z 0-9]

/w non-word =[^a-z A-Z 0-9]

. Any character except a newline

{n} matches the previous n times

{N,} matches the previous item n times or more (n times or more)

{N,m} matches the previous item n times but not more than m times

* Match Previous item 0 or more ={0,} (more than 0 times)

+ Match Previous item 1 or more times ={1,}

？ Matches the previous 0 or 1 times ={0,1}

Only numbers can be entered: "^[0-9]*$"

Verify phone Number: ("^ (\d{3.4}-) \d{7,8}$")

JS Regular expression (i)