Free tool which validates the given input string against the given regular expression and matches the output in accordance with the defined Regex.
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Following are the explanations for the flags used.
|Regex Parser Flags||Description|
|g (Global)||Don't return after the first match|
|s (Dot All)||Dot also matches newline|
|i (Case Insensitive)||Case insensitive match, ignores case of alphabets|
|m (Multiline)||Causes ^ and $ to match the begin/end of each line|
|D (Dollar)||Makes the dollar sign '$', to always match the end of the string, instead of end of the line|
|x (Extended)||Spaces in the pattern are ignored|
|U (Ungreedy)||The match becomes lazy by default|
Following are few example input regex and results for the sample input string
|[A-Z]||Character class: Literally matches all characters given inside '[' ']'||Once upon A time There was a King with Seven sons|
|[A-Za-z]+||Checks for one or more matches||Once upon A time|
|([A-Z])||Capturing group: Captures the matches of pattern within '(' and ')' in separate groups||Once upon A time|
|\w||Matches any word character (similar to [a-zA-Z0-9_])||Site|
|([A-Z])\w+||Capture all groups starting with uppercase alphabet and match all words starting with upper case alphabet followed by word character||Once|