RegExr: Learn, Build, & Test RegEx
RegExr is an online tool to learn, build, & test Regular Expressions (RegEx / RegExp). Supports JavaScript & PHP/PCRE RegEx. Results update in real-time as you type. Roll over a match or expression for details. Validate patterns with suites of Tests. Save & share expressions with others. Use Tools to explore your results. Full RegEx Reference with help & examples. Undo & Redo with {{getCtrlKey()}}
perlre - Perl regular expressions - Perldoc Browser
CONTENTS NAME DESCRIPTION The Basics Metacharacters Modifiers Overview Details on some modifiers /x and /xx Character set modifiers /l /u /d /a (and /aa) Which character set modifier is in effect? Character set modifier behavior prior to Perl 5.14 Regular Expressions Quantifiers Escape sequences Character Classes and other Special Escapes Assertions Capture groups Quoting metacharacters Extended P
Test your RewriteRules for Apache mod_rewrite
An easy way to test your RewriteRules against different URLs Makes debugging Apache mod_rewrite rules easier This tool lets you write and test your rewrite rules for Apache's mod_rewrite on-the-fly. Apache Docs for RewriteRule · Apache mod_rewrite guide Did this tool save you time? I've spent and continue to spend quite some time on building and maintaining this tool. If I managed to save you tim
Runaway Regular Expressions: Catastrophic Backtracking
Consider the regular expression (x+x+)+y. Before you scream in horror and say this contrived example should be written as xx+y or x{2,}y to match exactly the same without those terribly nested quantifiers: just assume that each “x” represents something more complex, with certain strings being matched by both “x”. See the section on HTML files below for a real example. Let’s see what happens when y
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is there isnumber() function in perl?