Regular Expressions 101

Save & Share

  • Regex Version: ver. 2
  • Update Regex
    ctrl+⇧+s
  • Save new Regex
    ctrl+s
  • Add to Community Library

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

r"
"

Test String

Substitution

Processing...

Code Generator

Generated Code

re = /(?m)^DOCUMENTATION.*(\"{3}|'{3})\n-*\n?([\s\S]+?)^\1[\s\S]*/ str = '#!/usr/bin/python # -*- coding: utf-8 -*- # (c) 2014, Ramon de la Fuente <ramon@delafuente.nl> # # This file is part of Ansible # # Ansible is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # Ansible is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with Ansible. If not, see <http://www.gnu.org/licenses/>. DOCUMENTATION = """ module: slack short_description: Send Slack notifications description: - The M(slack) module sends notifications to U(http://slack.com) via the Incoming WebHook integration version_added: 1.6 author: Ramon de la Fuente <ramon@delafuente.nl> options: domain: description: - Slack (sub)domain for your environment without protocol. (i.e. C(future500.slack.com)) required: true token: description: - Slack integration token required: true msg: description: - Message to send. required: true channel: description: - Channel to send the message to. If absent, the message goes to the channel selected for the I(token). required: false username: description: - This is the sender of the message. required: false default: ansible icon_url: description: - Url for the message sender\'s icon (default C(http://www.ansible.com/favicon.ico)) required: false icon_emoji: description: - Emoji for the message sender. See Slack documentation for options. (if I(icon_emoji) is set, I(icon_url) will not be used) required: false link_names: description: - Automatically create links for channels and usernames in I(msg). required: false default: 1 choices: - 1 - 0 parse: description: - Setting for the message parser at Slack required: false choices: - \'full\' - \'none\' validate_certs: description: - If C(no), SSL certificates will not be validated. This should only be used on personally controlled sites using self-signed certificates. required: false default: \'yes\' choices: - \'yes\' - \'no\' """ EXAMPLES = """ - name: Send notification message via Slack local_action: module: slack domain: future500.slack.com token: thetokengeneratedbyslack msg: "{{ inventory_hostname }} completed" - name: Send notification message via Slack all options local_action: module: slack domain: future500.slack.com token: thetokengeneratedbyslack msg: "{{ inventory_hostname }} completed" channel: "#ansible" username: "Ansible on {{ inventory_hostname }}" icon_url: "http://www.example.com/some-image-file.png" link_names: 0 parse: \'none\' """ SLACK_INCOMING_WEBHOOK = \'https://%s/services/hooks/incoming-webhook?token=%s\' def build_payload_for_slack(module, text, channel, username, icon_url, icon_emoji, link_names, parse): payload = dict(text=text) if channel is not None: payload[\'channel\'] = channel if (channel[0] == \'#\') else \'#\'+channel if username is not None: payload[\'username\'] = username if icon_emoji is not None: payload[\'icon_emoji\'] = icon_emoji else: payload[\'icon_url\'] = icon_url if link_names is not None: payload[\'link_names\'] = link_names if parse is not None: payload[\'parse\'] = parse payload="payload=" + module.jsonify(payload) return payload def do_notify_slack(module, domain, token, payload): slack_incoming_webhook = SLACK_INCOMING_WEBHOOK % (domain, token) response, info = fetch_url(module, slack_incoming_webhook, data=payload) if info[\'status\'] != 200: obscured_incoming_webhook = SLACK_INCOMING_WEBHOOK % (domain, \'[obscured]\') module.fail_json(msg=" failed to send %s to %s: %s" % (payload, obscured_incoming_webhook, info[\'msg\'])) def main(): module = AnsibleModule( argument_spec = dict( domain = dict(type=\'str\', required=True), token = dict(type=\'str\', required=True), msg = dict(type=\'str\', required=True), channel = dict(type=\'str\', default=None), username = dict(type=\'str\', default=\'Ansible\'), icon_url = dict(type=\'str\', default=\'http://www.ansible.com/favicon.ico\'), icon_emoji = dict(type=\'str\', default=None), link_names = dict(type=\'int\', default=1, choices=[0,1]), parse = dict(type=\'str\', default=None, choices=[\'none\', \'full\']), validate_certs = dict(default=\'yes\', type=\'bool\'), ) ) domain = module.params[\'domain\'] token = module.params[\'token\'] text = module.params[\'msg\'] channel = module.params[\'channel\'] username = module.params[\'username\'] icon_url = module.params[\'icon_url\'] icon_emoji = module.params[\'icon_emoji\'] link_names = module.params[\'link_names\'] parse = module.params[\'parse\'] payload = build_payload_for_slack(module, text, channel, username, icon_url, icon_emoji, link_names, parse) do_notify_slack(module, domain, token, payload) module.exit_json(msg="OK") # import module snippets from ansible.module_utils.basic import * from ansible.module_utils.urls import * main()' subst = '---\\n\\3' result = str.sub(re, subst) # Print the result of the substitution puts 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 Ruby, please visit: http://ruby-doc.org/core-2.2.0/Regexp.html