Regular Expressions 101

Save & Manage Regex

  • Current Version: 5
  • Save & Share
  • Community Library

Flavor

  • PCRE2 (PHP)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java
  • .NET 7.0 (C#)
  • Rust
  • PCRE (Legacy)
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests
Sponsors
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
Processing...

Test String

Substitution
Processing...

Code Generator

Language

Generated Code

import re regex = re.compile(r"([\s\S]+)\s*primary\s+key\s*\(\s*`([a-z]\w*)`\s*\)\s*(,\s*unique\s+key\s+uniq_\w+\s*\(`([a-z]\w*)`\))?(,\s*key\s+idx_\w+\s*\((\s*,?\s*`([a-z]\w*)`\s*)+\)\s*)+", flags=re.IGNORECASE) test_str = ("`id` INT (11) UNSIGNED NOT NULL AUTO_INCREMENT COMMENT 'primary',\n" "`stu_name` VARCHAR (10) NOT NULL DEFAULT '' COMMENT 'username',\n" "`stu_class` VARCHAR (10) NOT NULL DEFAULT '' COMMENT 'class',\n" "`stu_num` INT (11) NOT NULL DEFAULT '0' COMMENT 'study number',\n" "`stu_score` SMALLINT UNSIGNED NOT NULL DEFAULT '0' COMMENT 'total',\n" "`tuition` DECIMAL (5, 2) NOT NULL DEFAULT '0' COMMENT 'fee',\n" "`phone_number` VARCHAR (20) NOT NULL DEFAULT '0' COMMENT 'mobile',\n" "`create_time` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT 'record created time',\n" "`update_time` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT 'record updated time',\n" "`status` TINYINT NOT NULL DEFAULT '1' COMMENT 'some comment',\n" "PRIMARY KEY (`id`),\n" "UNIQUE KEY uniq_stu_num (`stu_num`),\n" "KEY idx_stu_score (`stu_score`),\n" "KEY idx_update_time_tuition (`update_time`, `tuition`)") subst = "\\2" result = regex.sub(subst, test_str) if result: print(result)

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 Python, please visit: https://docs.python.org/3/library/re.html