Regular Expressions 101

Extract URL parts only named capturing groups

Validates subdomain, root domain, and wild card domains

match: #aabbcc #abc (255,255,255) (255,255,255,255) 255,255,255 no match: #gggggg #ggg 256,256,256

Matching for mikrotik ROS 7 Used in promtail and grafana

Aquivalent solution for golang's unsupported negative lookahead in re2 flavor of go's regex. This example provides a negative lookahead similar to (?!/api/) ignoring routes with the /api/ prefix at the start.

Simple prefix matcher for validating URI Schemes according to [RFC2396, Section 3.1]( http://www.faqs.org/rfcs/rfc2396.html#3.5:~:text=well%20as%20%22http%22%29.-,scheme%20%20%20%20%20%20%20%20%3D%20alpha%20*%28%20alpha%20%7C%20digit%20%7C%20%22%2B%22%20%7C%20%22%2D%22%20%7C%20%22.%22%20%29,-Relative%20URI%20references) Go Playground: https://go.dev/play/p/vtYEugsNAfo

https://regex101.com/r/hIak43/1

W alpha/

Parse the typical connection string address like 123.123.123.123:123, supports the correct port and octet range

regex of challenge

Simple Regex to *validate * (no extraction!) an IPv4 Range which can be a comma separated mixture of IPv4 addresses IPv4 CIDRs IPv4 Ranges like 1.1.1.1-1.1.1.10 Examples : 192.168.1.1,255.255.255.255/32,10.10.10.10/24,0.0.0.0/24 192.168.1.1/32 192.168.1.1 192.168.1.1/32 192.168.1.1/12 192.168.1.1/24 192.168.1.1/24 192.168.1.1/0,192.168.1.1/0 10.0.0.0/24 172.16.0.1-172.16.0.255 192.168.1.1,10.0.0.1/24,172.16.0.1-172.16.0.10 64.33.232.212 64.33.232.210/24

This is made to validate an ISO 8601 input in a Terraform variable validation block: validation { condition = can(regex("^P(\\d+Y)?(\\d+M)?(\\d+D)?(T(\\d+H)?(\\d+M)?(\\d+S)?)?$", var.value)) error_message = "The value must be a valid ISO 8601 duration string representing time. (e.g. PT1M, PT1H30M, PT30S, etc.)" }

...

Splits a Docker image string into the separate parts: image, tag, digest tag and digest are optional

Kafka loki parser

0x28C6A6DdF8fF8A47A90A69bfE75cd89904a14d71

Dj dus er geen je een je aan je enige eerst een he we er

see https://stackoverflow.com/questions/76228402/regex-to-extract-n-where-n-is-digit

Testing Authelia subdomain / path rules. You can read more at the Authelia Docs By default, this regex101 page is shown a test for a generic API path domain: "some-sub.drpranavmishra.com" resources: "^/api([/?].*)?$" # API paths "^/healthz.*$" # Health check "^/\?[\S]{40,70}$" # PrivateBin policy: bypass`

Used by Zarf to obtain the name of a repository when given a git URL.

11

nginx access log regex

This regex extracts Kubernetes Resource URIs. Copyright 2021 Mathew Wicks Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

SQL comments on Big Query

^(((\d{3}1-9]|\d{2}[1-9]\d|\d[1-9]\d{2}|[1-9]\d{3})(\/)(((0[13578]|1[02])(\/)(0[1-9]|[12]\d|3[01]))|((0[469]|11)(\/)(0[1-9]|[12]\d|30))|(02(\/)(0[1-9]|[1]\d|2[0-8]))))|(((\d{2})(0[48]|[2468|13579)|((048]|[2468|3579)00))(\/)02(\/)29))$ Match year/month/day format. e.g: 2020/02/29 [match] 2021/02/29 [mismatch] 2021/08/25 [match]

Trying to adapt this regex to support LVM.

Used in Traefik to add slash

Check golang for presence of utf-8 char in rawEmail e.g. ?= =?UTF-8?Q? or =?3D?UTF-8?Q?

A regexp to validate an email address according to https://html.spec.whatwg.org/#valid-e-mail-address . Note that the backslash in the name part of the regexp on that site is there to escape the forward slash, which is not needed in Go.

for quadratic equations ||ax^2+bx+c=d||

Find all string matches with dir, one or more subdir, file name with optional extension. Common example with all capturing groups included: ../../dir/SubDir1/SubDir2/file.ext Note that Full path can begins with ./ or / patterns.

Find all string matches with dir, one or more subdir, file name with optional extension. Common example with all capturing groups included: C://ProgramFiles/MyDir1/myDir2/file.ext

Notes: Do not forget to escape the $ by an additional $. Escaping ? like \? does not work. But you could use [?] instead End result should be like this: "traefik.http.middlewares.r6tt-dev-web.stripprefixregex.regex=^/[a-z0-9/]+[a-z0-9]+([?]+.*)?$$"

Validates that you provide a CIDR in one of the following valid ranges. 0.0.0 – 127.255.255.255 127.0.0.0/8 0.0.0 – 10.255.255.255 10.0.0.0/8 16.0.0 – 172. 31.255.255 172.16.0.0/12 192.168.0.0 – 192.168.255.255 192.168.0.0/16 Subnets can be smaller (e.g. 192.168.0.0/17 is valid) but not larger (e.g. 192.168.0.0/15 is invalid). Single hosts (i.e. /32s) are invalid. Host bits are generally ignored (i.e. 192.168.1.2/16 is considered valid)

This regex can capture any column name from a select query. Be the original name, like are named on table, renamed with a reserved word AS or even without explicit AS. Go on, and test with your query ;)

This regexp can be used to validate domain names in Golang. While it cannot enforce the 253 character limit (with optional trailing period not included) that can be easily done by a simple len(domain) <= 253 check as well. This can be used as-is in other languages, even with RE2 regex engine. If positive lookbehind assertions are available, the character limit can be used. Non-capturing groups are used. Example validated domains (some may be invalid per TLD rules): example.com _25._tcp.SRV.example punycoded-idna.xn--zckzah under_score.example Example invalid domains: 192.0.2.1 has spaces.com easy,typo.example domain\.escapes.invalid no_trailing_.invalid -leading-or-trailing-.hyphens.invalid TLDs have more validation, the following will not validate: example digit.1example underscore._example_com but with a trailing period, the same rules as non-TLD are applied: example. 192.0.2.1. digit.1example. underscore._example_com.

gtgtg

Every valid line will be of the form: . . . NOTE: the distribution tag is expected to start with at least one letter and be followed by at least one digit.

Trying to get digits

walter1976LastClean

匹配.mka后缀名的文件，忽略大小写

匹配.mkv和.mp4后缀名中包含menu或sp或.sample，忽略大小写

plcnext version strings

ss

"1.2.3" Group 1: 1 Group 2: 2 Group 3: 3