Ansible regex replace variable. In most cases, you can use the short module name replace even without specifying the collections keyword. --- - hosts: all tasks: I have this Ansible as a String: FUBAR= { { PREFIX }}_ { { CNAME }} { { VERSION }} I want to replace all . regex_replace works fine when used on a variable set_fact: var: "{{ aVariable | ansible. Synopsis Input Positional parameters Keyword parameters Notes Examples Return Value Synopsis Replace a substring defined by a regular expression with another defined by another regular expression based on the first match. Like [ or . replace module – Replace all instances of a particular string in a file using a back-referenced regular expression Note This module is part of ansible-core and included in all Ansible installations. site. For example, you might want to use a system default for some items and control the value for others. I'm trying to capture the main version number of a variable, and to do this I'm trying to remove the numbers after the main version number: In variable. 3" tasks: - replace: dest: . regex('old','new') }}" but does nothing to the text, if it is prevouslt filte I'm trying to replace a value in a config file, using the replace module. builtin. To make a module variable optional, set the default value to the special variable omit: I have some variables like 'service', which can be "abc" or "xyz", and 'site', which can be "bos" or "sfo", on different hosts. You can use regex_escape() to escape the regex pattern, i. regex_search for easy linking to the plugin documentation and to avoid conflicting with other collections that may have the same filter plugin name. I have written following code but regular expression and storing the variable both have some issues. - hosts: abc tasks: - name: Replace first occurence of Making variables optional By default, Ansible requires values for all variables in a templated expression. But it's not clear how to register the substring/group corresponding to the matched pattern into a new variable. I’ll make a pull request here: https://docs. 17. Then, using that same literal text, tell regex_replace to swap out the variable part with the new bookends Learn to replace strings and lines across multiple systems or files with the Ansible replace module. windows. 9. The replace filter or regex_replace can be used to replace data in a string or variable. so in this case these are the vars: backup_facts = "hello,world" custom = "prab" so the end results I would like is: "hello, prab" after the replace. py | cut The template, taken from the first example in the filter documentation is the same in both variables, but the output is not correct in the multi-line template. In this comprehensive guide, you‘ll gain an in-depth understanding of how to use Ansible regex capabilities to extract and transform data. 0. com with its first part (test in the example). care. Notice in this example that Hello World is wrapped in quotes. Here's what I've got: - name: extract Unique Key shell: "grep UNIQUE_KEY . The replace module is used to replace data in a file. Is there any way to reuse the variable in set_fact that uses filter(s) ? `regex`: If set to `true`, the `search` argument will be treated as a regular expression. It turns out that some of the lines you try to replace contain characters that have a special meaning in Python’s regex language. When wrapped in quotes, Hello World is interpreted as a string. `count`: The number of times to replace the search string. For example, the following playbook will replace all instances of the character `’%’` with the character `’_’` in the file `/etc/ansible/hosts`: yaml – name: Replace character in string 0. Input This describes the input of the filter, the value before | ansible. vars: asterisk_db_host: "172. I tried to use split what would fail in the third case . The value of joomlaversion is 4. /config. regex_replace or the replace filter can be used to replace data in a string, variable or list. for "lineinfile" and "replace" functionalities. regex_replace filter – replace a string via regex Note This filter plugin is part of ansible-core and included in all Ansible installations. NOTE: The solution below is a generic solution when both the regexp and replace arguments can contain any special characters. if per instance no + is passed in the variable The situation Using Ansible, you may quickly find yourself in a situation where you need to modify a configuration file. While I can do this by explicitly mentioning the new strings as args to regex_replace in map, I One way of solving this is to make the quotes around the value part of your replacement (because when you do this, there will be a non-digit character -- the quote -- separating your backreference from the value of the template expansion). I have a variable called joomlaversion which I get using json_query. With replace, you can use a single command to: Find and replace strings across your infrastructure Employ regex patterns for advanced matching Control replacements selectively in certain file sections. 5 main_version: "{{ versi This filter plugin is part of ansible-core and included in all Ansible installations. Can somebody tell me what’s going on, and how I can make this filter work in a multi-line string? Ansible lets you automate system administration. Replace and inline module in Ansible is used to replace string and line. template Template a file out to a target host. staging. . ansible regex ansible-playbook strings Share Improve this question asked Aug 20, 2021 at 9:05 3 debug: msg: "{{backup_facts | replace(',world',',{{custom}}')}}" register: replace_csv in the above code, I am trying to replace a string/word in a variable with a variable. com/ansible/latest/user_guide/playbooks_filters. yml': line 12, column 101, but may be elsewhere in the file depending on the exact syntax problem. (regex: ^test-auth (. Thanks! Synopsis ¶ Replace a substring defined by a regular expression with another defined by another regular expression based on the first match. The Ansible replace module functions by searching the specified file in the task for a particular string or regular expression & replacing it with a new value. Ansible would report the following error: In a playbook, I try to extract the last character of variable "ansible_hostname". 2 but I am trying to swap the dots with dashes so it becomes 4-0-2 How can I substitute dots for Learn how to use Ansible replace module to span multiple lines with regex. service Learn how to use Ansible's regex filters to search, extract, and replace text. community. debug: msg: "{{ 'Hello World' | regex_replace('Hello', 'Goodbye This module is part of ansible-core and included in all Ansible installations. See multiline and regex examples. My use case is that I want to create CNAME records, using the route53 module, for names like thing-N. ansible. I am trying to replace localhost in the string $amp_conf['AMPDBHOST'] = 'localhost'; with the content of the variable {{ asterisk_db_host }}, which is 172. Apr 18, 2025 · Learn how to use the Ansible replace module to replace strings and lines in Ansible files. replace Replace all instances of a particular string in a file using a back-referenced regular expression. In this example, "Hello" is replaced with "Goodbye". If you want to substitute the value of a variable, the variable name needs to be referenced outside of quotes ("port" is a string, port is a variable reference). I would like to be able to replace any line from the file which matches line from the variable until the "=" sign. In some instances this variable contains a "-" to separate two values. html To add this example…'Tis was a lot of looking around. yml In this little howto, I want to do the following: I want to change some text in a variable from A to B; specifically I want to change the variable contents from: My Super Secure password is RedHat1… Octopus deploy handles variable replacement in config files this way, which is what I have the most experience with. win_lineinfile Ensure a particular line is in a file, or replace an existing line using a back-referenced regular expression. The `regex_search` filter is Ansible’s go-to tool for this, allowing you to apply regex patterns to strings and return matching substrings. strftime for easy linking to the plugin documentation and to avoid conflicting with other collections that may have the same filter plugin name. Summary ansible. I think about to use the replace module of Ansible for this. Explore practical examples, including extracting kernel versions from package lists. I simplified my piece of script with this ad- How to find a match using regex in ansible playbook where variable appears in the regex_search argument? The following playbook doesn't find the match when run using: ansible-playbook playbook. service. domain. This is how i am doing - set_fact: variable: "{{ value | regex_replace("84","89") | regex_replace("7 Note that, as of Ansible 2. I need to replace the first occurrence of a certain string in a specific file. I have hosts whose FQDNs are like service-site-thing-N. However, you can make specific module variables optional. In this example, Hello is replaced with Goodbye. While it might not be necessary, it is clearest to send that literal text through | regex_escape to let the computer do any regex quoting for you. ansible regexp for replace space quotes or comment Asked 2 years, 3 months ago Modified 2 years, 3 months ago Viewed 1k times I'm trying to get the value of a variable in a file into an Ansible variable so I can use it. For example, Numbers: - 2211 - 2211-2212 When this is the ca when: deploy_fork | match( "{{ pattern }}" ) With this approach, I'm able to reuse the variable pattern in the match filter, but not on the set_fact line where I assign the extracted text to another variable. *?=)) I read the Ansible doc. yml: version: 3. e. はじめに Ansible で 動的に取得した変数値などを、replaceやtemplateモジュール、commandモジュールでのsedなどを利用せずに、Jinja2 filtersで正規表現を扱えないか調べたところregex_replaceが用意されていました。 However, we recommend you use the Fully Qualified Collection Name (FQCN) ansible. 0, short form tasks should have any escape sequences backslash-escaped in order to prevent them being parsed as string literal escapes. yml A workaround is to use the regex_replace filter, this is only for \n, but you would need to do it for every escape sequence (there are many of them) - name: test unsafe variable in the file regex_replace: This is used to replace a matched pattern in a string with another string. The error appears to have been in '/ABC/Ansible/roles/NewRelic_Base/tasks/main. 3 Use ansible variable in replace string for regex_replace Asked 6 years, 3 months ago Modified 6 years, 3 months ago Viewed 13k times Making variables optional By default, Ansible requires values for all variables in a templated expression. the string used in the regexp part, and you can use regex_replace("\\\\", "\\\\\\\\") to safely escape the replace part (keep in mind that the replacement Automation for the People! A Subreddit dedicated to fostering communication in the Ansible Community, includes Ansible, AWX, Ansible Tower, Ansible Galaxy, ansible-lint, Molecule, etc. Note This filter plugin is part of ansible-core and included in all Ansible installations. com, which have those those variables set accordingly, in a group like 'things'. regex_replace. i can make it work, but its really cumbersome . I want to replace the " and \r\ from a variable content using Ansible. […] Ansibleで regex_ 系フィルターの使い方を、共通のサンプルテキストを使ってまとめました。 基本構文 { { string | regex_ (pattern, replacement/flags) }} 使用フィルター一覧 フィルター Jinja2 doesn't seem to apply the regex_replace while setting nodeid, so { { nodeid }} results in an empty variable and the json_query errors as it cannot run using empty lookup data. --- - hosts: localhost tasks: - name: replace 'Hello' with 'Goodbye' ansible. I want to generate a new list from files by prepending /auto and appending _sw_table to each element. I am trying to replace the unnecessary words from the below string using regex_replace but unable to do to so for the last part of it. However, many users encounter frustrating issues where `regex_search` fails to find matches **when variables are used in the regex pattern**. Here's one option: gather_facts: false. /cfgfile Learn how to use Ansible's regex filters to search, extract, and replace text. The regex_search filter in Ansible allows you to leverage the might of regex to search and filter data right within your playbooks. 5 days ago · ansible. Currently, I have the following play: - name: Replace " I wanted to read the value for dataDir using Ansible and set it to a variable. I have the following data in a variable result thatI register the output to the variable from the previous task Hi, I have two register variable in a play and want to replace one with another in a play. if i pass +foobar to the playbook into the variable netgroup the + is not removed. I have a variable in my playbook that's derived from a list. Learn how to search and replace a string or a line with Ansible. My intention is to match and replace the whole URL like test. ansible. Like every sensible Ansible user, you will use Ansible’s lineinfile. String: Test_[u'Net::Route Domain: RD2001'] Regex being used: Regular expressions (regex) enable powerful, flexible matching of text patterns within strings. In most cases, you can use the short plugin name regex_search. Does Ansible have any way of doing this? I could write a script to do it I suppose and just have Ansible call that, but I was hoping for a built in way of configuration variable replacement as code. I try to use regex_replace filter to do that, but nothing works. And the replace module provides a way to manipulate text files without all those SSH sessions. To make a module variable optional, set the default value to the special variable omit: Explore how to use the replace module in Ansible to search for a specified pattern in a file and replace it with a given string. in the concatenated string with '', like this: FUBAR I am using regex_replace filter in ansible. However, we recommend you use the Fully Qualified Collection Name (FQCN) ansible. In most cases, you can use the short plugin name regex_replace. However, I was wondering if there is an OR function or similar. ansible - example of using map + regex_replace to modify all items in a list - 00_play. 5lywk, 0lo7ul, 2q0ny, jaft, 1x0sr, 9tn8ob, uqt6r, fv4d, fegibz, wznu6,