RegExp Match Doesnt Contain Words RegEx to tell if a string does not contain a specific character Are you trying to test whether or not a string does not contai
RegEx to tell if a string does not contain a specific character
Are you trying to test whether or not a string does not contain a character using regular expressions ?
Are you trying:
- Use Regex to enable the widest range of validations, and
- Always look for a positive match (i.e. instead of using !Regex.IsMatch(cell, regexvariable), I wanted to rely on always being able to use Regex.IsMatch(cell, regexvariable) since the majority of DataTables invoking this method will be using the positive match instead of the negative.
Solution
I came across this question looking for the same thing but for JavaScript. The expression above did not work in my case, but I came across the below expression which did:
RegExp
^((?!0).)*$
RegExp Explanation
- Match whole strings except
0
(zero)
Other example
i want to find and match a string
from all local javascript file import statement
without .js
extension:
RegExp
^import.*\/((?!.js).)*([\'\"]);$
RegExp Modern Approach
^import.*\/((?!.js).)*(['"]);$
String to match
import notranslate from '../translator/notranslate.js';
import notranslate from '../translator/notranslate'; // <-- i want match this
RegExp Explanation
^
asserts position at start of a lineimport
matches the characters import literally (case sensitive)((?!.js).)*
1st Capturing Group*
matches the previous token between zero and unlimited times, as many times as possible, giving back as needed (greedy)A repeated capturing group will only capture the last iteration. Put a capturing group around the repeated group to capture all iterations or use a non-capturing group instead if you're not interested in the data
/
matches the character/
with literally (case sensitive)
(?!.js)
Negative LookaheadAssert that the Regex below does not match
.
matches any character (except for line terminators)
js
matches the characters js literally (case sensitive)
.
matches any character (except for line terminators)([\'\"])
2nd Capturing Group[\'\"]
Match a single character present in the list below
\'
matches the character'
with literally (case sensitive)
\"
matches the character"
with literally (case sensitive)
;
matches the character;
with literally (case sensitive)$
asserts position at the end of a line
Global pattern flags
g
modifier: global. All matches (don't return after first match)m
modifier: multi line. Causes^
and$
to match the begin/end of each line (not only begin/end of string)