RegExLib.com - The first Regular Expression Library on the Web!

\w?<\s?\/?[^\s>]+(\s+[^"'=]+(=("[^"]*")|('[^\']*')|([^\s"'>]*))?)*\s*\/?>

&quot;([^&quot;](?:\\.|[^\\&quot;]*)*)&quot;

(\w[-._\w]*\w@\w[-._\w]*\w\.\w{2,3})

^([a-zA-Z]\:)(\\[^\\/:*?<>"|]*(?<![ ]))*(\.[a-zA-Z]{2,6})$

(\b\w+\b) # Match a word and capture it \s+ \1 # Use backreference \1 to match double-ups

(?'openingTag'&lt;) \s*? (?'tagName'\w+) # Once we've got the tagname, match zero # or more attribute sequences (\s*? # Atomic Grouping for efficiency (?&gt; (?!=[\/\?]?&gt;) # Lookahead so that we can fail quickly # match Attribute pieces (?'attribName'\w+) (?:\s* (?'attribSign'=) \s* ) (?'attribValue' (?:\'[^\']*\'|\&quot;[^\&quot;]*\&quot;|[^ &gt;]+) ) ) )* \s*? # Closing Tag can be either &gt; or /&gt; (?'closeTag'[\/\?]?&gt;)

# Greedy, no-backtracking and only named groups capture. (?n) ^ ( (?'allowDay'Sun|Mon|Fri) | (Sat # if we match 'ur' then constrain # the next char with a lookahead # for 'd' so that we don't match on # Satur. (?'allowDay'ur(?=d))? ) | ( ( ( T ( # Accepts &quot;Tu.&quot;, &quot;Tue.&quot; ue? | # Accepts &quot;Th.&quot;, &quot;Thu.&quot; or &quot;Thur.&quot; h(ur?)? ) ) | ( Wed # if &quot;ne&quot; matched then constrain # the next chars with a lookahead # for 'sd' so that we don't match on # Wedne. (ne(?=sd))? ) ) ( # If 'Tue' or 'Thur' or 'Wedne' matched # then match 's' in the &quot;allowDay&quot; Group. (?&lt;=(e|r)) (?'allowDay's) )? ) ) # Optional ending match of &quot;day&quot; or &quot;.&quot; ( # if Group[allowDay] succeeded then allow # the letters &quot;day&quot; or a full-stop. If it # did not succeed, a full-stop is required. (?(allowDay)day)|\. )? $

(\d{4,6})

^(\d+|[a-zA-Z]+)$

(?s)/\*.*\*/

.*?$(?<!\.aspx)

^ISBN\s(?=[-0-9xX ]{13}$)(?:[0-9]+[- ]){3}[0-9]*[xX0-9]$

(?<=^|[\s ]+)[^\!\@\%\$\s ]*([\!\@\%\$][^\!\@\%\$\s ]*){2,}(?=[\s ]+|$)

(?n) (?# ExplicitCapture - capture named groups only ) ^ -? (?# Optional sign ) ( \d{1,8}(\.\d{1,2})? (?# Decimal point and trailing digits optional ) | \d{0,8}(\.\d{1,2}) (?# Leading digits optional ) ) $

(?'DateLiteral' (?# Per the VB Spec : DateLiteral ::= '#' [ Whitespace+ ] DateOrTime [ Whitespace+ ] '#' ) \#\s* (?'DateOrTime' (?# DateOrTime ::= DateValue Whitespace+ TimeValue | DateValue | TimeValue ) (?'DateValue' (?# DateValue ::= Whitespace+ TimeValue | DateValue | TimeValue ) ( (?# DateValue ::= MonthValue / DayValue / YearValue | MonthValue - DayValue - YearValue ) (?'Month'(0?[1-9])|1[0-2]) (?# Month 01 - 12 ) (?'Sep'[-/]) (?# Date separator '-' or '/' ) (?'Day'0?[1-9]|[12]\d|3[01]) (?# Day 01 - 31 ) \k'Sep' (?# whatever date separator was previously matched ) (?'Year'\d{1,4}) \s+ (?# TimeValue ::= HourValue : MinuteValue [ : SecondValue ] [ WhiteSpace+ ] [ AMPM ] ) (?'HourValue'(0?[1-9])|1[0-9]|2[0-4]) (?# Hour 01 - 24 ) [:] (?'MinuteValue'0?[1-9]|[1-5]\d|60) (?# Minute 01 - 60 ) [:] (?'SecondValue':0?[1-9]|[1-5]\d|60)? (?# Optional Minute :01 - :60 ) \s* (?'AMPM'[AP]M)? ) | ( (?# DateValue ::= MonthValue / DayValue / YearValue | MonthValue - DayValue - YearValue ) (?'Month'(0?[1-9])|1[0-2]) (?# Month 01 - 12 ) (?'Sep'[-/]) (?# Date separator '-' or '/' ) (?'Day'0?[1-9]|[12]\d|3[01]) (?# Month 01 - 31 ) \k'Sep' (?# whatever date separator was previously matched ) (?'Year'\d{4}) ) | ( (?# TimeValue ::= HourValue : MinuteValue [ : SecondValue ] [ WhiteSpace+ ] [ AMPM ] ) (?'HourValue'(0?[1-9])|1[0-9]|2[0-4]) (?# Hour 01 - 24 ) [:] (?'MinuteValue'0?[1-9]|[1-5]\d|60) (?# Minute 01 - 60 ) [:] (?'SecondValue':0?[1-9]|[1-5]\d|60)? (?# Optional Minute :01 - :60 ) \s* (?'AMPM'[AP]M)? ) ) ) \s*\# )

^( 100(?:\.0{1,2})? | 0*?\.\d{1,2} | \d{1,2}(?:\.\d{1,2})? )% $