+1+ greedy1 or more of the preceding expression, using as many chars as possibleabcccc+ccc *?0+ lazy0 or more of the preceding expression, using as few chars as possibleabcccc*?c +?1+ lazy1 or more of the preceding expression, using as few chars as possibleabcccc+?c ...
* Matches 0 or more repetitions of the preceding symbol. + Matches 1 or more repetitions of the preceding symbol. ? Makes the preceding symbol optional. {n,m} Braces. Matches at least "n" but not more than "m" repetitions of the preceding symbol. (xyz) Character group. Matches the cha...
"[0-9]{2,3}" => The number was 9.9997 but we rounded it off to 10.0. Test the regular expressionWe can leave out the second number. For example, the regular expression [0-9]{2,} means: Match 2 or more digits. If we also remove the comma, the regular expression [0-9]{3}...
Zero or more of a a* One or more of a a+ Exactly 3 of a a{3} 3 or more of a a{3,} Between 3 and 6 of a a{3,6} Start of string ^ End of string $ A word boundary \b Non-word boundary \B Regular Expression No Match ...
The value of theassemblynameparameter'sNameproperty is an empty or null string. -or- The regular expression pattern of one or more objects inregexinfoscontains invalid syntax. ArgumentNullException assemblynameorregexinfosisnull. COMException
matchTimeout is negative, zero, or greater than approximately 24 days. RegexMatchTimeoutException A time-out occurred. For more information about time-outs, see the Remarks section. Examples The following example uses the Replace(String, String, String, RegexOptions, TimeSpan) method to replace...
A REGEX pattern can also contain groups enclosed by parentheses “( )”. Groups can be used to capture parts of the matched text, or to apply quantifiers or modifiers to the whole group. For example, “(ab)+” matches one or more occurrences of “ab”, and “(\d{3})-(\d{4})”...
\w+Match one or more word characters. esMatch the literal string "es". \bEnd the match at a word boundary. Remarks TheMatches(String, String, RegexOptions)method is similar to theMatch(String, String, RegexOptions)method, except that it returns information about all the matches found in the...
X, once or not at atX<*?/th<>td headers=“matches reluc reluc_zero_or_more”X>, zero or more timesX+?X, 一次或多次X{n}?
\w{5} matches any five-letter word or a five-digit number. a{5} will match “aaaaa”. \d{11} matches an 11-digit number such as a phone number. [a-z]{3,} will match any word with three or more letters such as “cat”, “room” or “table. Or, for example, the expression...