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This article mainly introduces the regular expressions commonly used in the collection and collation project, which have a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, let the editor take you to understand it.

A recent internal system project involves a lot of text validation, which uses some common regular expressions.

Regular expressions that match Chinese characters: [\ u4e00 -\ u9fa5]

Match double-byte characters (including Chinese characters): [^\ X00 -\ xff] can be used to calculate the length of a string (a double-byte character length meter 2)

Regular expression that matches blank lines:\ n\ s*\ r can be used to delete blank lines

A regular expression that matches the HTML tag:

] * >. *? |

This can only match part of it, and there is nothing you can do about complex nested tags.

Regular expressions that match leading and trailing white space characters: ^\ s * |\ sblank $can be used to delete white space characters (including spaces, tabs, page breaks, etc.) at the beginning and end of a line, which is a very useful expression

Regular expressions that match Email addresses:\ w + ([- +.]\ w +) * @\ w + ([-.]\ w +) *.\ w + ([-.]\ w +) * form validation is very useful

The regular expression that matches the URL URL: [a-zA-z] +: / / [^\ s] * this can basically meet the demand.

Match whether the account is legal (starting with letters, allowing 5-16 bytes, allowing alphanumeric underscores) ^ [a-zA-Z] [a-zA-Z0-9 _] {4j 15} $form validation is very useful

Match domestic phone number:\ d {3} -\ d {8} |\ d {4} -\ d {7} matching form such as 0511-4405222 or 021-87888822

Match Tencent QQ number: [1-9] [0-9] {4,} Tencent QQ number starts from 10000

Match China Postal Code: [1-9]\ d {5} (?!\ d) China Postal Code is 6 digits

Matching ID card:\ d {15} |\ d {18} Chinese ID card is 15 or 18 digits (except for x)

^\ d *\. [0-9]\ matching $/ / matching numbers (including decimals)

^ [1-9]\ positive integer matching $/ /

^-[1-9]\ negative integer matching $/ /

^ -? [1-9]\ match integer

^ [1-9]\ d* | 0 $/ / matches a non-negative integer (positive integer + 0)

^-[1-9]\ d* | 0 $/ / matches non-positive integers (negative integers + 0)

^ [1-9]\ d *\.\ d * | 0\.\ d * [1-9]\ dfloat $/ / matches positive floating point numbers

^-([1-9]\ d *.\ d * | 0.\ d * [1-9]\ d *) $/ / matches negative floating point numbers

^ -? ([1-9]\ d *.\ d * | 0\.\ d * [1-9]\ d * | 0?\ .0 + | 0) $/ / match floating point number

^ [1-9]\ d *.\ d * | 0\.\ d * [1-9]\ d * | 0?\ .0 + | 0 $/ / matches non-negative floating point numbers (positive floating point number + 0)

^ (- ([1-9]\ d *\.\ d * | 0\.\ d * [1-9]\ d *)) | 0?\ .0 + | 0 $/ / matches non-positive floating point numbers (negative floating point + 0)

^ [A-Za-z] + $/ / matches a string of 26 English letters

^ [Amurz] + $/ / matches a string of 26 English letters in uppercase

^ [amurz] + $/ / matches a string of 26 lowercase letters

^ [A-Za-z0-9] + $/ / matches a string of numbers and 26 letters

^\ w match $/ / match a string consisting of numbers, 26 letters, or underscores

The following is actually a code snippet of an enumerated class in the code. I am a little lazy, so I don't want to sort it out in detail:

/ * regular expression of scientific counting * /

REGEX_SCIEN ("^ ((\\ dcounting.?\\ d +) [Ee] {1} (\\ d +)) $", "regular expression of Scientific Counting")

/ * * Mobile number verifies regular expression * /

REGEX_MOBILE ("^ 1 (3 | 5 | 8) [0-9] {9} $", "Mobile number validates regular expression")

/ * regular expression of amount format * /

REGEX_AMOUNT ("^ [-]? [\\ d] {1Magne 10} ([.] {1} [\\ d] {1JEI 2})? $", "regular expression of amount format")

/ * * yyyyMM regular expression * /

REGEX_MONTH ("^ ([1-9]\\ d {3}) (([0] [1-9]) | ([1] [0-2])) $", "yyyyMM regular expression")

/ * yyyyMMdd date format regular expression * /

REGEX_DATE (

"(([0-9] {3} [1-9] | [0-9] {2} [1-9] [0-9] {1} | [0-9] {1-9] [0-9] {2} | [1-9] [0-9] {3}) ((0 [13578] | 1 [02]) (0 [1-9] | [12] [0-9] | 3 [01])) | (0 [469] | 11) (0 [01]) [1-9] | [12] [0-9] | 30)) | (02 (0 [1-9] | [1] [0-9] | 2 [0-8]) | ((0-9] {2}) (0 [48] | [2468] [048] | [13579] [26])) 0229) ")

"yyyyMMdd date format regular expression")

/ * * Email validates regular expressions * /

REGEX_EMAIL (

"^ (([_\\ w -\\] +) @ ((\\ [[0-9] {1rem 3}\. [0-9] {1rem 3}\\.) | (([_\\ w -] +\\.)) ([a-zA-Z] {2pm 4} | [0-9] {1pm 3}) (\\]?) $"

"Email validates regular expressions")

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