\s?\d[.,]?\d*)\p{Sc}* is defined as shown in the following table. Start the match at the beginning of a word boundary. Today I want to look at a feature that is really useful when … They are used in many Linux programs like grep, bash, rename, sed, etc. If the regexp has whitespaces put it in a variable first. The $' substitution replaces the matched string with the entire input string after the match. The ${name} language element substitutes the last substring matched by the name capturing group, where name is the name of a capturing group defined by the (?) language element. The following table illustrates how the $_ substitution causes the regular expression engine to replace each match in the input string. Any text that precedes the matched text is unchanged in the result string. In a regular expression pattern, $ is an anchor that matches the end of the string. The regular expression pattern \b(\d+)(\.(\d+))? Finally, in our replace section of the sed regular expression command, we will call back/recall the text selected by these search groups, and insert them as replacement strings. That is, it duplicates the input string after the match while removing the matched text. All digits that follow $ are interpreted as belonging to the number group. Using Bash's regular expressions Bash has quietly made scripting on Unix systems a lot easier with its own regular expressions. For example, in the regular expression (\w)(?\d), the index of the digit named group is 2. A group is opened with “\(” and closed with “\)”.Grouping can be used in combination with back-referencing. Group Constructs. Because the replacement pattern is, Match a white space, followed by one or more decimal digits, followed by zero or one period or comma, followed by zero or more decimal digits. For example, you can use the replacement string $ {1}1 instead of $11 to define the replacement string as the value of the first captured group along with the number "1". The following example matches one or more decimal digits in the input string. In order to use the results of a match in the "search" part in the "replace" part of the sed command, use "\"+match_number. means any character that appears exactly once, but . That is, it removes the matched text and replaces it with the entire string, including the matched text. These regular expressions contain combinations of more than one expression. For example, the ($&) replacement pattern adds parentheses to the beginning and end of each match. In the above examples, the echo command creates strings using the brace expansion. Many quantifiers modify the character sets that precede them. Inserted text is shown in bold in the results column. The following example identifies duplicate words in a string and uses the $+ substitution to replace them with a single occurrence of the word. Best How To : Update, based on the OP's clarification re environment and his own findings:. Roll over a match or expression for details. Match one or more decimal digits. Character Classes. Click here if the video is not accessible. Using sed to replace string in file by using regex capture group. This is the third capturing group. If there are multiple matches in an input string, the replacement text is derived from the original input string, rather than from the string in which text has been replaced by earlier matches. In this example, the input string "aa1bb2cc3dd4ee5" contains five matches. All digits that follow $ are interpreted as belonging to the number group. The following example uses the $& substitution to add quotation marks at the beginning and end of book titles stored in a string array. 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