How Conditon regex if .. else

Question

Now REGULAR EXPRESSION

<a\s(class|href|target)=\"(.*)\"\s(class|href|target)=\"(.*)\"\s(class|href|target)=\"(.*)\">(.*)<\/a>/g

MATCH THIS LINK

<a href="index.php" target="5454 target 54" class="nav">test</a>

But i want to use only one regex using conditions match every url

example:

<a href="index.php">cal</a>
<a class="xxx" href="index.php">cal</a>
<a class="navbar-brand" href="index.php" target="">cal<span>.net</span></a>

I test this in: https://regex101.com

and GET MATHCH INFO LIKE THIS

If you want to get all links from a document, you may (better) use a DOM parser like [DOMDocument](http://php.net/manual/en/domdocument.getelementsbytagname.php). In any case you need to describe what you want not achieve. Currently you had described what was not working. — feeela, Jul 19 '16 at 09:41
@MariaDeleva I want MATCH INFOMATION (if you use https://regex101.com left hand box like this MATCH 1 1. [3-8] `class` 2. [10-22] `navbar-brand` 3. [24-28] `href` 4. [30-39] `index.php` 5. [41-47] `target` 6. [49-49] `` 7. [51-71] `nav.net` — Alohajung Vipatchavatee, Jul 19 '16 at 10:13
@Richard Use 1 only one regex using conditions match all example — Alohajung Vipatchavatee, Jul 19 '16 at 10:16
See [this regex demo](https://regex101.com/r/nD2pN7/1). However, this is not the right way, using DOM is much cleaner and more readable and maintainable, and is easier to implement actually. — Wiktor Stribiżew, Jul 19 '16 at 10:22
See @WiktorStribiżew's suggestion, you can access the different match groups by their number: `$1`, for example. — Maria Ivanova, Jul 19 '16 at 10:25
@WiktorStribiżew I want MATCH INFOMATION (if you use regex101.com left hand box like this MATCH 1 1. [3-8] class 2. [10-22] navbar-brand 3. [24-28] href 4. [30-39] index.php 5. [41-47] target 6. [49-49] `` 7. [51-71] nav.net — Alohajung Vipatchavatee, Jul 19 '16 at 10:47
only one problem is the spaces. if I put 2 spaces doesn't work @splash58 — Alohajung Vipatchavatee, Jul 19 '16 at 10:55
@splash58 before > and between attribute example class and href — Alohajung Vipatchavatee, Jul 19 '16 at 11:04
@splash58 Loss some MATCH INFOMATION . I want like this https://regex101.com/r/nD2pN7/1 — Alohajung Vipatchavatee, Jul 19 '16 at 11:16
@WiktorStribiżew only one problem is the spaces. if I put 2 spaces doesn't work . Problem in before > and between attribute example class and href — Alohajung Vipatchavatee, Jul 19 '16 at 11:18
You are going to have more and more problems with regex, you know? See https://regex101.com/r/nD2pN7/3 - but this is my last contribution here. It must finally make you agree that regex is not the best thing to use for HTML parsing. — Wiktor Stribiżew, Jul 19 '16 at 11:27
[Obligatory link to the famous StackOverflow post](http://stackoverflow.com/a/1732454/1954610) — Tom Lord, Jul 19 '16 at 11:35
@AlohajungVipatchavatee Don't mention it. When you get tired to correct your regex, ask to do it with DOM parser :) — splash58, Jul 19 '16 at 11:54

Thomas Ayoub · Accepted Answer · 2016-07-19T11:33:20.887

2

You can use this (demo):

<a
    \s*(?:(class|href|target)=\"(.*?)\")?
    \s*(?:(class|href|target)=\"(.*?)\")?
    \s*(class|href|target)=\"(.*?)\"
    \s*
>
    (.*?)
<\/a>

It uses optional non capturing groups: (?:)? and lazy quantifiers *?. The output is:

MATCH 1
5.  [3-7]   `href`
6.  [9-18]  `index.php`
7.  [20-23] `cal`
MATCH 2
1.  [31-36] `class`
2.  [38-41] `xxx`
5.  [43-47] `href`
6.  [49-58] `index.php`
7.  [60-63] `cal`
MATCH 3
1.  [71-76] `class`
2.  [78-90] `navbar-brand`
3.  [92-96] `href`
4.  [98-107]    `index.php`
5.  [109-115]   `target`
6.  [117-117]   ``
7.  [119-139]   `cal<span>.net</span>`

edited Jul 19 '16 at 11:33

answered Jul 19 '16 at 11:14

Thomas Ayoub

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if i 2space before > NOT MATCH – Alohajung Vipatchavatee Jul 19 '16 at 11:22
example : cal – Alohajung Vipatchavatee Jul 19 '16 at 11:22
Just add `\s*` before `>` @AlohajungVipatchavatee – Thomas Ayoub Jul 19 '16 at 11:32

How Conditon regex if .. else

1 Answers1