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javascriptex（javascriptex） JavaScript commonly used regular expression validation The following are some of the more commonly used regular expressions I collected, because usually when possible in the form of validation, use more. Send out, make friends in common use. Ha-ha。 Regular expression matching Chinese characters: [u4e00-u9fa5] Commentary: Chinese, really is a headache, with this expression is easy. Matching double byte characters (including Chinese characters,:[^x00-xff]) Commentary: can be used to calculate the length of the string (a double byte character length of 2 characters, ASCII 1) Regular expression matching blank line: ns*r Commentary: can be used to remove blank lines Regular expression matching HTML markers: (S*?) [^]*.*? |.? Commentary: the spread of the Internet version is too bad, this is only for the matching part, a nested tag complex is still incapable of action Regular expression matching both blank characters: ^s*|s*$ Commentary: can be used to remove the trailing blank characters (including spaces, tabs, formfeed etc.), expression is very useful Regular expression matching Email address: w+ ([-+.]w+) *@w+ ([-.]w+) *.w+ ([-.]w+) * Commentary: form validation is very practical Regular expression matching. URL: [a-zA-z]+: //[^s]* Commentary: the online version of the spread function is very limited, the above basic can meet the needs of Matching account is legitimate (letter, allow 5-16 bytes, allow alphanumeric underline):^[a-zA-Z][a-zA-Z0-9_]{4,15}$ Commentary: form validation is very practical Matching domestic telephone number: d{3}-d{8}|d{4}-d{7} Commentary: the form, such as 0511-4405222 or 021Tencent QQ number: [1-9][0-9]{4,}, Commentary: Tencent QQ numbers start from 10000 China, post encoding: [1-9]d{5} (D?!) Commentary: Chinese post encoding 6 digits Match ID: d{15}|d{18} Commentary: China ID is 15 or 18 Address: d+.d+.d+.d+, IP Commentary: useful extraction IP address Matching specific number: ^[1-9]d*$/ /, positive