Regular Expressions 101

Save & Share

Flavor

  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java 8
  • .NET 7.0 (C#)
  • Rust
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests

Tools

Sponsors
There are currently no sponsors. Become a sponsor today!
An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.
  • All Tokens
  • Common Tokens
  • General Tokens
  • Anchors
  • Meta Sequences
  • Quantifiers
  • Group Constructs
  • Character Classes
  • Flags/Modifiers
  • Substitution
  • A single character of: a, b or c
    [abc]
  • A character except: a, b or c
    [^abc]
  • A character in the range: a-z
    [a-z]
  • A character not in the range: a-z
    [^a-z]
  • A character in the range: a-z or A-Z
    [a-zA-Z]
  • Any single character
    .
  • Alternate - match either a or b
    a|b
  • Any whitespace character
    \s
  • Any non-whitespace character
    \S
  • Any digit
    \d
  • Any non-digit
    \D
  • Any word character
    \w
  • Any non-word character
    \W
  • Non-capturing group
    (?:...)
  • Capturing group
    (...)
  • Zero or one of a
    a?
  • Zero or more of a
    a*
  • One or more of a
    a+
  • Exactly 3 of a
    a{3}
  • 3 or more of a
    a{3,}
  • Between 3 and 6 of a
    a{3,6}
  • Start of string
    ^
  • End of string
    $
  • A word boundary
    \b
  • Non-word boundary
    \B

Regular Expression
No Match

/
/
gm

Test String

Code Generator

Language

Generated Code

import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main(String[] args) { final String regex = "(<)(.*?[^>]+)"; final String string = "<table class=\\\"mce-item-table\\\" style=\\\"border-collapse: collapse; width: 676px; word-break: break-all; outline: none; height: 5px; border-bottom: 1px solid rgb(27, 105, 178); text-align: left;\\\" contenteditable=\\\"false\\\"><caption style=\\\"display: none; \\\" data-mce-style=\\\"display: none; outline: grey solid 2px;\\\"></caption><tbody><tr><th style=\\\"outline: none; width: 95px; text-align: left; vertical-align: top; background-color: rgb(27, 105, 178);\\\" data-mce-style=\\\"outline: none; width: 95px; text-align: left; vertical-align: top; background-color: #1b69b2;\\\"><span style=\\\"color: rgb(255, 255, 255);\\\" data-mce-style=\\\"color: #ffffff;\\\"><strong>Application</strong></span></th><th style=\\\"outline: none; width: 173px; text-align: left; vertical-align: top; background-color: rgb(27, 105, 178);\\\" data-mce-style=\\\"outline: none; width: 173px; text-align: left; vertical-align: top; background-color: #1b69b2;\\\"><span style=\\\"color: rgb(255, 255, 255);\\\" data-mce-style=\\\"color: #ffffff;\\\"><strong>Platform</strong></span></th><th style=\\\"outline: none; width: 212px; text-align: left; vertical-align: top; background-color: rgb(27, 105, 178);\\\" data-mce-style=\\\"outline: none; width: 212px; text-align: left; vertical-align: top; background-color: #1b69b2;\\\"><span style=\\\"color: rgb(255, 255, 255);\\\" data-mce-style=\\\"color: #ffffff;\\\"><strong>URL</strong></span></th><th style=\\\"outline: none; width: 194px; text-align: left; vertical-align: top; background-color: rgb(27, 105, 178);\\\" data-mce-style=\\\"outline: none; width: 194px; text-align: left; vertical-align: top; background-color: #1b69b2;\\\"><span style=\\\"color: rgb(255, 255, 255);\\\" data-mce-style=\\\"color: #ffffff;\\\"><strong>Cost</strong></span></th></tr><tr><td style=\\\"outline: none; width: 95px; text-align: left; vertical-align: top; background-color: rgb(255, 253, 233);\\\" data-mce-style=\\\"outline: none; width: 95px; text-align: left; vertical-align: top; background-color: #fffde9;\\\">FileZilla</td><td style=\\\"outline: none; width: 173px; text-align: left; vertical-align: top; background-color: rgb(255, 253, 233);\\\" data-mce-style=\\\"outline: none; width: 173px; text-align: left; vertical-align: top; background-color: #fffde9;\\\">Windows, Mac, Linux</td><td style=\\\"outline: none; width: 212px; text-align: left; vertical-align: top; background-color: rgb(255, 253, 233);\\\" data-mce-style=\\\"outline: none; width: 212px; text-align: left; vertical-align: top; background-color: #fffde9;\\\"><a>https:/<wbr>/<wbr>filezilla-project.org</a></td><td style=\\\"outline: none; width: 194px; text-align: left; vertical-align: top; background-color: rgb(255, 253, 233);\\\" data-mce-style=\\\"outline: none; width: 194px; text-align: left; vertical-align: top; background-color: #fffde9;\\\">Free download</td></tr><tr><td style=\\\"outline: none; width: 95px; text-align: left; vertical-align: top; background-color: rgb(255, 252, 214);\\\" data-mce-style=\\\"outline: none; width: 95px; text-align: left; vertical-align: top; background-color: #fffcd6;\\\">SmartFTP</td><td style=\\\"outline: none; width: 173px; text-align: left; vertical-align: top; background-color: rgb(255, 252, 214);\\\" data-mce-style=\\\"outline: none; width: 173px; text-align: left; vertical-align: top; background-color: #fffcd6;\\\">Windows</td><td style=\\\"outline: none; width: 212px; text-align: left; vertical-align: top; background-color: rgb(255, 252, 214);\\\" data-mce-style=\\\"outline: none; width: 212px; text-align: left; vertical-align: top; background-color: #fffcd6;\\\"><a>https:/<wbr>/<wbr>www.smartftp.com</a></td><td style=\\\"outline: none; width: 194px; text-align: left; vertical-align: top; background-color: rgb(255, 252, 214);\\\" data-mce-style=\\\"outline: none; width: 194px; text-align: left; vertical-align: top; background-color: #fffcd6;\\\">Free download</td></tr><tr><td style=\\\"outline: none; width: 95px; text-align: left; vertical-align: top; background-color: rgb(255, 253, 233);\\\" data-mce-style=\\\"outline: none; width: 95px; text-align: left; vertical-align: top; background-color: #fffde9;\\\">CuteFTP</td><td style=\\\"outline: none; width: 173px; text-align: left; vertical-align: top; background-color: rgb(255, 253, 233);\\\" data-mce-style=\\\"outline: none; width: 173px; text-align: left; vertical-align: top; background-color: #fffde9;\\\">Windows, Mac</td><td style=\\\"outline: none; width: 212px; text-align: left; vertical-align: top; background-color: rgb(255, 253, 233);\\\" data-mce-style=\\\"outline: none; width: 212px; text-align: left; vertical-align: top; background-color: #fffde9;\\\"><a>https:/<wbr>/<wbr>www.cuteftp.com</a></td><td style=\\\"outline: none; width: 194px; text-align: left; vertical-align: top; background-color: rgb(255, 253, 233);\\\" data-mce-style=\\\"outline: none; width: 194px; text-align: left; vertical-align: top; background-color: #fffde9;\\\">Free trial download, academic pricing available</td></tr><tr><td style=\\\"outline: none; width: 95px; text-align: left; vertical-align: top; background-color: rgb(255, 252, 214);\\\" data-mce-style=\\\"outline: none; width: 95px; text-align: left; vertical-align: top; background-color: #fffcd6;\\\">WS_FTP</td><td style=\\\"outline: none; width: 173px; text-align: left; vertical-align: top; background-color: rgb(255, 252, 214);\\\" data-mce-style=\\\"outline: none; width: 173px; text-align: left; vertical-align: top; background-color: #fffcd6;\\\">Windows</td><td style=\\\"outline: none; width: 212px; text-align: left; vertical-align: top; background-color: rgb(255, 252, 214);\\\" data-mce-style=\\\"outline: none; width: 212px; text-align: left; vertical-align: top; background-color: #fffcd6;\\\"><a>https:/<wbr>/<wbr>www.ipswitch.com</a></td><td style=\\\"outline: none; width: 194px; text-align: left; vertical-align: top; background-color: rgb(255, 252, 214);\\\" data-mce-style=\\\"outline: none; width: 194px; text-align: left; vertical-align: top; background-color: #fffcd6;\\\">Free trial download</td></tr></tbody></table>"; final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE); final Matcher matcher = pattern.matcher(string); while (matcher.find()) { System.out.println("Full match: " + matcher.group(0)); for (int i = 1; i <= matcher.groupCount(); i++) { System.out.println("Group " + i + ": " + matcher.group(i)); } } } }

Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Java, please visit: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html