means any character in pattern matching? Where in the documentation does it say that . Since 3.0, Bash supports the =~ operator to the [[ keyword. 2. I'm sure this is simple, I just can't get my brain around it. And you can use them in a number of different places: After the == in a bash [[ expr ]] expression. Even dash supports [^chars], but not posh. Unix/Linux find command “patterns” FAQ: How do I find files or directories that don’t match a specific pattern (files not matching a regex pattern, or filename pattern)?. Non greedy text matching and extrapolating in bash. 4521. Regular expression to match a line that doesn't contain a word. Difference to Regular Expressions. * All of the extglob quantifiers supported by bash were supported by ksh88. Regular expressions are great at matching. [^chars] is merely a commonly-supported extension. Simple Regex match not working. Regex OR ( Not working) 1. With regular expressions you need to use the ^ or $ to anchor the pattern respectively at the start and end of the subject if you want to match the subject as a whole and not within it. Stating a regex in terms of what you don't want to match is a bit harder. In man bash it says: Pattern Matching Any character that appears in a pattern, other than the special pattern characters described below, matches itself. Regular expressions is not the same as shell pattern matching… To do a case insensitive match in bash, you can use the nocasematch option: That applies to shell pattern matching … 1. And while I'm comparing glob patterns to regular expressions, there's an important point to be made that may not be immediately obvious: glob patterns are just another syntax for doing pattern matching in general in bash. 3. This operator matches the string that comes before it against the regex pattern that follows it. ... How to check if a string contains a substring in Bash. Regular Expression Matching (REMATCH) Match and extract parts of a string using regular expressions. How can I check if a directory exists in a Bash shell script? Related. I'd like to be able to match based on whether it has one or more of those strings -- or possibly all. 1. bash regex does not recognize all groups. It's easy to formulate a regex using what you want to match. 3866. 6. Bash does not process globs that are enclosed within "" or ''. Linux bash provides a lot of commands and features for Regular Expressions or regex. Bash regex test not working. 2377. Sed command that would ignore any commented match. I know that BASH =~ regex can be system-specific, based on the libs available -- in this case, this is primarily CentOS 6.x (some OSX Mavericks with Macports, but not needed) Thanks! Bash regex matching not working in 4.1. R-egular E-xpression MATCH-ing (the first many times I read the word "rematch", I just could not help my thoughts drifting back to Hulk Hogan taking on André the Giant at WrestleMania IV- those were the days...) is performed using commands on the form: A qualifier identifies what to match and a quantifier tells how often to match the qualifier. 1. Bash regex, match string beween two strings. The most significant difference between globs and Regular Expressions is that a valid Regular Expressions requires a qualifier as well as a quantifier. * Counter-intuitively, only the [!chars] syntax for negating a character class is specified by POSIX for shell pattern matching. Regular expressions (regex) are similar to Glob Patterns, but they can only be used for pattern matching, not for filename matching. 1. Regular Expression to Given a list of strings (words or other characters), only return the strings that do not match. One easy way to exclude text from a match is negative lookbehind: w+b(?