# Regexp examples in tcl

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*2020-02-23 08:12*

You can experiment with regular expressions using the VisualRegexp or Visual REGEXP applications. More on the theoretical background and practical use of regular expressions (there is lots to cover! ) can be found in the book Mastering Regular Expressions by J. Friedl.11 Regular Expressions This chapter describes regular expression pattern matching and string processing based on regular expression substitutions. Tcl commands described: regexp and regsub. Regular expressions are a formal way to describe string patterns. They provide a powerful and compact way to specify patterns in your data. regexp examples in tcl

14 rows The regexp command is used to match a regular expression in Tcl. A regular expression is

Tcl's pattern matching facilities test whether a given string matches a specified pattern. Patterns are described using a syntax known as regular expressions. For example, the pattern expression consisting of a single period matches any character. The pattern a. . a matches any fourcharacter string whose first and last characters are both a. There are a number of important differences between Tcl Advanced Regular Expressions and Perlstyle regular expressions. Tcl uses \m, \M, \y and \Y for word boundaries. Perl and most other modern regex flavors use \b and \B. In Tcl, these last two match a backspace and a backslash, respectively.**regexp examples in tcl** Regular Expressions 101 Tcl also supports string operations known as regular expressions Several commands can access these There are also two explicit commands for parsing regular expressions. Regular expressions can be expressed in just a few rules. Regular expression parsing is more powerful