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Is there a regular expressions tool for Linux to ease the creation of big regular expressions, such as Expresso for instance, for Windows?

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You might try txt2regex. It isn't as advanced as Expresso, but it's a Bash script, believe it or not. It's available in the Ubuntu repositories and may be in the ones for other distributions.

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One such tool is Visual Regexp (Ubuntu install link).

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Consider using an online tool. This would work on any platform. I often use this one to create/test big regexes: It supports several syntaxes, including Perl, Java, Python, ...

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