Common regular expressions

One 、 Check the expression of a number

• Numbers ：^[0-9]*$
• n Digit number ：^\d{n}$
• At least n Digit number ：^\d{n,}$
• m-n Digit number ：^\d{m,n}$
• Zero and non-zero digits ：^(0|[1-9][0-9]*)$
• A number with a maximum of two decimal places beginning with a nonzero ：^([1-9][0-9]*)+(\.[0-9]{1,2})?$
• belt 1-2 Positive or negative number of decimal places ：^(\-)?\d+(\.\d{1,2})$
• Positive numbers 、 negative 、 And decimal fraction ：^(\-|\+)?\d+(\.\d+)?$
• A positive real number with two decimal places ：^[0-9]+(\.[0-9]{2})?$
• Yes 1~3 Positive real number of decimal places ：^[0-9]+(\.[0-9]{1,3})?$
• Nonzero positive integer ：^[1-9]\d*$ or ^([1-9][0-9]*){1,3}$ or ^\+?[1-9][0-9]*$
• Nonzero negative integer ：^\-[1-9][]0-9"*$ or ^-[1-9]\d*$
• Non-negative integer ：^\d+$ or ^[1-9]\d*|0$
• Non positive integer ：^-[1-9]\d*|0$ or ^((-\d+)|(0+))$
• Nonnegative floating point number ：^\d+(\.\d+)?$ or ^[1-9]\d*\.\d*|0\.\d*[1-9]\d*|0?\.0+|0$
• Non positive floating point number ：^((-\d+(\.\d+)?)|(0+(\.0+)?))$ or ^(-([1-9]\d*\.\d*|0\.\d*[1-9]\d*))|0?\.0+|0$
• Positive floating point ：^[1-9]\d*\.\d*|0\.\d*[1-9]\d*$ or ^(([0-9]+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*))$
• Negative floating point number ：^-([1-9]\d*\.\d*|0\.\d*[1-9]\d*)$ or ^(-(([0-9]+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*)))$
• Floating point numbers ：^(-?\d+)(\.\d+)?$ or ^-?([1-9]\d*\.\d*|0\.\d*[1-9]\d*|0?\.0+|0)$

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Expression for check character

• Chinese characters ：^[\u4e00-\u9fa5]{0,}$
• English and numbers ：^[A-Za-z0-9]+$ or ^[A-Za-z0-9]{4,40}$
• The length is 3-20 All characters of ：^.{3,20}$
• from 26 A string of English letters ：^[A-Za-z]+$
• from 26 A string of uppercase letters ：^[A-Z]+$
• from 26 A string of lowercase letters ：^[a-z]+$
• By numbers and 26 A string of English letters ：^[A-Za-z0-9]+$
• By digital 、26 A string of English letters or underscores ：^\w+$ or ^\w{3,20}$
• chinese 、 english 、 Numbers include underscores ：^[\u4E00-\u9FA5A-Za-z0-9_]+$
• chinese 、 english 、 Number but excluding symbols such as underscores ：^[\u4E00-\u9FA5A-Za-z0-9]+$ or ^[\u4E00-\u9FA5A-Za-z0-9]{2,20}$
• Can be entered with ^%&',;=?$\" Equal character ：[^%&',;=?$\x22]+
• Disable input containing ~ The characters of ：[^~\x22]+

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3、 ... and 、 Expression of special requirements

• Email Address ：^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$ perhaps  ([\w-][email protected][\w-]+\.[\w\-]+)
• domain name ：[a-zA-Z0-9][-a-zA-Z0-9]{0,62}(\.[a-zA-Z0-9][-a-zA-Z0-9]{0,62})+\.?
• InternetURL：[a-zA-z]+://[^\s]* or ^http://([\w-]+\.)+[\w-]+(/[\w-./?%&=]*)?$
• Phone number ：^(13[0-9]|14[5|7]|15[0|1|2|3|4|5|6|7|8|9]|18[0|1|2|3|5|6|7|8|9])\d{8}$
• Phone number ("XXX-XXXXXXX"、"XXXX-XXXXXXXX"、"XXX-XXXXXXX"、"XXX-XXXXXXXX"、"XXXXXXX" and "XXXXXXXX)：^(\(\d{3,4}-)|\d{3.4}-)?\d{7,8}$
• Domestic phone number (0511-4405222、021-87888822)：\d{3}-\d{8}|\d{4}-\d{7}
• Phone number regular expression （ Mobile number support ,3-4 Bit area code ,7-8 Bit live number ,1－4 Extension number ）: ((\d{11})|^((\d{7,8})|(\d{4}|\d{3})-(\d{7,8})|(\d{4}|\d{3})-(\d{7,8})-(\d{4}|\d{3}|\d{2}|\d{1})|(\d{7,8})-(\d{4}|\d{3}|\d{2}|\d{1}))$)
• ID number (15 position 、18 Digit number ), The last bit is the check bit , May be a number or character X：(^\d{15}$)|(^\d{18}$)|(^\d{17}(\d|X|x)$)
• Is the account number legal ( Beginning of letter , allow 5-16 byte , Allow alphanumeric underscores )：^[a-zA-Z][a-zA-Z0-9_]{4,15}$
• password ( Start with a letter , The length is in 6~18 Between , Can only contain letters 、 Numbers and underscores )：^[a-zA-Z]\w{5,17}$
• Strong password ( Must contain a combination of upper and lower case letters and numbers , Special characters cannot be used , The length is in 8-10 Between )：^(?=.*\d)(?=.*[a-z])(?=.*[A-Z])[a-zA-Z0-9]{8,10}$
• Strong password ( Must contain a combination of upper and lower case letters and numbers , Special characters can be used , The length is in 8-10 Between )：^(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,10}$
• Date format ：^\d{4}-\d{1,2}-\d{1,2}
• One year 12 Months (01～09 and 1～12)：^(0?[1-9]|1[0-2])$
• A month 31 God (01～09 and 1～31)：^((0?[1-9])|((1|2)[0-9])|30|31)$
• Input format of money ：
  1. There are four forms of money we can accept :"10000.00" and "10,000.00", And no " branch " Of "10000" and "10,000"：^[1-9][0-9]*$
  2. This means that either of them can't 0 Number at the beginning , however , It also means a character "0" Not through , So we take the following form ：^(0|[1-9][0-9]*)$
  3. One 0 Or one doesn't 0 Number at the beginning . We can also allow a minus sign at the beginning ：^(0|-?[1-9][0-9]*)$
  4. This means a 0 Or a start that may be negative is not 0 The number of . Let users 0 The beginning is good. . Remove the minus sign as well , Because money can't be negative . What we're going to add here is the possible decimal part ：^[0-9]+(.[0-9]+)?$
  5. It must be noted that , There should be at least one after the decimal point 1 digit , therefore "10." No way , however "10" and "10.2" Yes. ：^[0-9]+(.[0-9]{2})?$
  6. In this way, we stipulate that there must be two decimal places after the decimal point , If you think it's too harsh , It can be like this ：^[0-9]+(.[0-9]{1,2})?$
  7. This allows the user to write only one decimal place . Now it's time to think about commas in numbers , We can do this ：^[0-9]{1,3}(,[0-9]{3})*(.[0-9]{1,2})?$
  8. 1 To 3 A digital , Follow any one comma +3 A digital , Comma as optional , Not necessarily ：^([0-9]+|[0-9]{1,3}(,[0-9]{3})*)(.[0-9]{1,2})?$
  9. remarks ： This is the end result , Don't forget "+" It can be used "*" Instead, if you think empty strings are acceptable ( strange , Why? ?) Last , Don't forget to remove the backslash when using functions , Common mistakes are here
• xml file ：^([a-zA-Z]+-?)+[a-zA-Z0-9]+\\.[x|X][m|M][l|L]$
• Regular expression of Chinese characters ：[\u4e00-\u9fa5]
• Double byte character ：[^\x00-\xff] ( Including Chinese characters , Can be used to calculate the length of a string ( A double byte character length meter 2,ASCII Character meter 1))
• Regular expression for blank lines ：\n\s*\r ( Can be used to delete blank lines )
• HTML Tagged regular expression ：<(\S*?)[^>]*>.*?|<.*? /> ( Regular expression of first and last whitespace characters ：^\s*|\s*$ or (^\s*)|(\s*$) ( Can be used to delete blank characters at the beginning and end of a line ( Including Spaces 、 tabs 、 Page breaks and so on ), Very useful expressions )
• tencent QQ Number ：[1-9][0-9]{4,} ( tencent QQ Number from 10000 Start )
• China Post Code ：[1-9]\d{5}(?!\d) ( China Post code is 6 Digit number )
• IPv4 Address ：((2(5[0-5]|[0-4]\d))|[0-1]?\d{1,2})(\.((2(5[0-5]|[0-4]\d))|[0-1]?\d{1,2})){3}