I have searched for an answer, but couldn't find a direct one. Closest I got to was this: regular expression for anything but an empty string in c , but that doesn't really work for me.. There are a lot of pattern types that can match empty strings. There are other pattern types matching empty strings, and it is not always obvious how to prevent them from matching empty strings. However inside character class you don't to do all that escaping you're doing.
Your regex can be simplified to:. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Method Description exec Executes a search for a match in a string. It returns an array of information or null on a mismatch.
It returns true or false. It returns the index of the match, or -1 if the search fails. Flag Description Corresponding property d Generate indices for substring matches. See sticky. Note: Several examples are also available in: The reference pages for exec , test , match , matchAll , search , replace , split This guide articles': character classes , assertions , groups and ranges , quantifiers , Unicode property escapes. Logical nullish assignment??
Object initializer Operator precedence Optional chaining?. TypeError: setting getter-only property "x" SyntaxError: Unexpected ' ' used outside of class body SyntaxError: identifier starts immediately after numeric literal SyntaxError: illegal character TypeError: cannot use 'in' operator to search for 'x' in 'y' RangeError: invalid array length ReferenceError: invalid assignment left-hand side TypeError: invalid assignment to const "x" RangeError: invalid date SyntaxError: for-in loop head declarations may not have initializers SyntaxError: a declaration in the head of a for-of loop can't have an initializer TypeError: invalid 'instanceof' operand 'x' TypeError: 'x' is not iterable SyntaxError: JSON.
Unicode property escapes. Executes a search for a match in a string. Returns an array containing all of the matches, including capturing groups, or null if no match is found. Tests for a match in a string. Executes a search for a match in a string, and replaces the matched substring with a replacement substring.
Executes a search for all matches in a string, and replaces the matched substrings with a replacement substring. The index at which to start the next match. This property is set only if the regular expression uses the g option, described in Advanced Searching With Flags.
The text of the pattern. Updated at the time that the regular expression is created, not executed. Perform a "sticky" search that matches starting at the current position in the target string. If no time-out is defined in the Regex constructor call or in the application domain's properties, or if the time-out value is Regex. InfiniteMatchTimeout , no exception is thrown. The following example defines a regular expression that matches words beginning with the letter "a".
It uses the RegexOptions. IgnoreCase option to ensure that the regular expression locates words beginning with both an uppercase "a" and a lowercase "a". The Match String, String, RegexOptions method returns the first substring that matches a regular expression pattern in an input string. The RegexMatchTimeoutException exception is thrown if the execution time of the matching operation exceeds the time-out interval specified for the application domain in which the method is called.
If no time-out is defined in the application domain's properties, or if the time-out value is Regex. This method times out after an interval that is equal to the default time-out value of the application domain in which it is called. If a time-out value has not been defined for the application domain, the value InfiniteMatchTimeout , which prevents the method from timing out, is used. The recommended static method for retrieving a pattern match is Match String, String , which lets you set the time-out interval.
The Match String, Int32 method returns the first substring that matches a regular expression pattern, starting at or after the startat character position, in an input string. The regular expression pattern for which the Match String, Int32 method searches is defined by the call to one of the Regex class constructors.
You can optionally specify a starting position in the string by using the startat parameter. When the regular expression engine parses from left to right the default , the match and the scan move rightward, starting at the character specified in startat. When the regular expression engine parses from right to left when the regular expression pattern is constructed with the RegexOptions.
RightToLeft option , the match and scan move in the opposite direction and begin with the character at startat If you do not specify a starting position, the search begins at the default startat position.
If the regular expression searches from left to right, the default startat position is at the left end of input ; if it searches from right to left, the default startat position is at the right end of input. This restricts the match so it must start exactly at startat. This method returns the first substring found at or after the startat character position in input that matches the regular expression pattern. Matches String, Int32 method.
If you do not set a time-out interval when you call the constructor, the exception is thrown if the operation exceeds any time-out value established for the application domain in which the Regex object is created. The following example finds regular expression pattern matches in a string, then lists the matched groups, captures, and capture positions. The third match attempt begins at the position after the x in the string. The first alternative matches 1 and the third match is found.
After x is matched, it makes one more match attempt starting at the end of the string. So depending on how the engine advances after zero-length matches, it finds either three or four matches. One exception is the JGsoft engine. The JGsoft engine advances one character after a zero-length match, like most engines do. But it has an extra rule to skip zero-length matches at the position where the previous match ended, so you can never have a zero-length match immediately adjacent to a non-zero-length match.
In our example the JGsoft engine only finds two matches: the zero-length match at the start of the string, and 1. Python 3. The gsub function to search-and-replace skips zero-length matches at the position where the previous non-zero-length match ended, but the finditer function returns those matches.
So a search-and-replace in Python gives the same results as the Just Great Software applications, but listing all matches adds the zero-length match at the end of the string.
It handles zero-length matches like Perl. This means regular expressions that can find zero-length matches are not compatible between Python 3. PCRE 8.
0コメント