Regular expressions that match Chinese characters: [\u4e00-\u9fa5] Commentary: It's a pain in the neck to match up with this expression.
Match Double-byte characters (including Chinese characters): [^\x00-\xff] Commentary: the length that can be used to compute a string (a double-byte character length meter 2,ascii 1 characters)
Regular expression matching blank rows: \n\s*\r commentary: Can be used to delete blank lines
Regular expression:< matching HTML tags (\s*?) [^>]*>.*?| < *? /> Commentary: The version of the Internet is too bad, the above can only match the part of the complex nested tags still powerless
Regular expressions that match the last and last whitespace characters: ^\s*|\s*$ commentary: A very useful expression that you can use to delete a line at the end of a header (including spaces, tabs, page breaks, and so on)
Regular expression matching an email address: \w+ ([-+.] \w+) *@\w+ ([-.] \w+) *\.\w+ ([-.] \w+) * Commentary: Form validation is practical
Regular expressions that match URL URLs: [a-za-z]+://[^\s]* Commentary: Online circulation of the version of the function is very limited, above this basic to meet the needs
Match account number is legal (start of letter, allow 5-16 bytes, allow alphanumeric underline): ^[a-za-z][a-za-z0-9_]{4,15}$ Commentary: Form validation is practical
Matching domestic phone number: \d{3}-\d{8}|\d{4}-\d{7} commentary: Match form such as 0511-4405222 or 021-87888822
Matching Tencent QQ Number: [1-9][0-9]{4,} commentary: Tencent QQ number starting from 10000
Match China ZIP Code: [1-9]\d{5} (?! \d) Commentary: China postal code is 6 digits
Matching ID: \d{15}|\d{18} commentary: China's ID card is 15-or 18-digit
Matching IP address: \d+\.\d+\.\d+\.\d+ Commentary: Useful when extracting IP addresses
Match a range: @ "<table>[\s\S]+?</table>"
Matching connection address: </? (a| A) (.*?>|>)
Match a specific number:
^[1-9]\d*$//Matching positive integer
^-[1-9]\d*$//matching negative integers
^-? [1-9]\d*$//matching integer
^[1-9]\d*|0$//matching nonnegative integer (positive integer + 0)
^-[1-9]\d*|0$//matching non positive integer (negative integer + 0)
^[1-9]\d*\.\d*|0\.\d*[1-9]\d*$//matching positive floating-point numbers
^-([1-9]\d*\.\d*|0\.\d*[1-9]\d*) $//matching negative floating-point number
^-? ([1-9]\d*\.\d*|0\.\d*[1-9]\d*|0?\.0+|0) $//matching floating-point number
^[1-9]\d*\.\d*|0\.\d*[1-9]\d*|0?\.0+|0$//matching nonnegative floating-point number (positive floating-point number + 0)
^ (-([1-9]\d*\.\d*|0\.\d*[1-9]\d*)) |0?\.0+|0$//matching non-positive floating-point numbers (negative floating-point number + 0) Commentary: useful for processing large amounts of data, attention to correction when applied
Match a specific string:
^[a-za-z]+$//Match a string of 26 English letters
^[a-z]+$//Match a string of 26 uppercase letters
^[a-z]+$//Match string consisting of 26 lowercase letters
^[a-za-z0-9]+$//Match a string of numbers and 26 English letters
^\w+$//Match A string of numbers, 26 English letters, or underscores
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