Regular Expressions 101

Save & Share

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

/
/
gmiuJ

Test String

Code Generator

Language

Generated Code

package main import ( "regexp" "fmt" ) func main() { var re = regexp.MustCompile(`(?mi)(class+)=["']?((?:.(?!["']?\s+(?:\S+)=|[>"']))+.)["']?`) var str = `<div> @if($beforeTableSlot) <div class="mt-8"> @include($beforeTableSlot) </div> @endif <div class="relative"> <div class="flex justify-between items-center mb-1"> <div class="flex-grow h-10 flex items-center"> @if($this->searchableColumns()->count()) <div class="w-96 flex rounded-lg shadow-sm"> <div class="relative flex-grow focus-within:z-10"> <div class="absolute inset-y-0 left-0 pl-3 flex items-center pointer-events-none"> <svg class="h-5 w-5 text-gray-400" viewBox="0 0 20 20" stroke="currentColor" fill="none"> <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z" /> </svg> </div> <input wire:model.debounce.500ms="search" class="w-full pl-10 py-3 text-sm leading-4 block rounded-md border-gray-300 shadow-sm focus:border-blue-300 focus:ring focus:ring-blue-200 focus:ring-opacity-50 focus:outline-none" placeholder="{{__('Search in')}} {{ $this->searchableColumns()->map->label->join(', ') }}" type="text" /> <div class="absolute inset-y-0 right-0 pr-2 flex items-center"> <button wire:click="$set('search', null)" class="text-gray-300 hover:text-red-600 focus:outline-none"> <x-icons.x-circle class="h-5 w-5 stroke-current" /> </button> </div> </div> </div> @endif </div> <div class="flex items-center space-x-1"> <x-icons.cog wire:loading class="h-9 w-9 animate-spin text-gray-400" /> @if($exportable) <div x-data="{ init() { window.livewire.on('startDownload', link => window.open(link,'_blank')) } }" x-init="init"> <button wire:click="export" class="flex items-center space-x-2 px-3 border border-green-400 rounded-md bg-white text-green-500 text-xs leading-4 font-medium uppercase tracking-wider hover:bg-green-200 focus:outline-none"><span>{{ __('Export') }}</span> <x-icons.excel class="m-2" /></button> </div> @endif @if($hideable === 'select') @include('datatables::hide-column-multiselect') @endif </div> </div> @if($hideable === 'buttons') <div class="p-2 grid grid-cols-8 gap-2"> @foreach($this->columns as $index => $column) <button wire:click.prefetch="toggle('{{ $index }}')" class="px-3 py-2 rounded text-white text-xs focus:outline-none {{ $column['hidden'] ? 'bg-blue-100 hover:bg-blue-300 text-blue-600' : 'bg-blue-500 hover:bg-blue-800' }}"> {{ $column['label'] }} </button> @endforeach </div> @endif <div class="rounded-lg shadow-lg bg-white max-w-screen overflow-auto"> <div class="rounded-lg @unless($this->hidePagination) rounded-b-none @endif"> <div class="table align-middle min-w-full"> @unless($this->hideHeader) <div class="table-row divide-x divide-gray-200"> @foreach($this->columns as $index => $column) @if($hideable === 'inline') @include('datatables::header-inline-hide', ['column' => $column, 'sort' => $sort]) @elseif($column['type'] === 'checkbox') @unless($column['hidden']) <div class="w-32 py-4 flex justify-center overflow-hidden align-top px-6 border-b border-gray-200 bg-gray-50 text-left text-xs leading-4 font-medium text-gray-500 uppercase tracking-wider focus:outline-none"> <div class="px-3 py-1 rounded @if(count($selected)) bg-orange-400 @else bg-gray-200 @endif text-white text-center"> {{ count($selected) }} </div> </div> @endunless @else @include('datatables::header-no-hide', ['column' => $column, 'sort' => $sort]) @endif @endforeach </div> <div class="table-row divide-x divide-blue-200 bg-blue-100"> @foreach($this->columns as $index => $column) @if($column['hidden']) @if($hideable === 'inline') <div class="table-cell w-5 overflow-hidden align-top bg-blue-100"></div> @endif @elseif($column['type'] === 'checkbox') <div class="overflow-hidden align-top bg-blue-100 px-6 py-5 border-b border-gray-200 text-left text-xs leading-4 font-medium text-gray-500 uppercase tracking-wider flex h-full flex-col items-center space-y-2 focus:outline-none"> <div>SELECT ALL</div> <div> <input type="checkbox" wire:click="toggleSelectAll" @if(count($selected) === $this->results->total()) checked @endif class="form-checkbox mt-1 h-4 w-4 text-blue-600 transition duration-150 ease-in-out" /> </div> </div> @else <div class="table-cell overflow-hidden align-top"> @isset($column['filterable']) @if( is_iterable($column['filterable']) ) <div wire:key="{{ $index }}"> @include('datatables::filters.select', ['index' => $index, 'name' => $column['label'], 'options' => $column['filterable']]) </div> @else <div wire:key="{{ $index }}"> @include('datatables::filters.' . ($column['filterView'] ?? $column['type']), ['index' => $index, 'name' => $column['label']]) </div> @endif @endisset </div> @endif @endforeach </div> @endif @forelse($this->results as $result) <div class="table-row p-1 divide-x divide-gray-100 {{ isset($result->checkbox_attribute) && in_array($result->checkbox_attribute, $selected) ? 'bg-orange-100' : ($loop->even ? 'bg-gray-100' : 'bg-gray-50') }}"> @foreach($this->columns as $column) @if($column['hidden']) @if($hideable === 'inline') <div class="table-cell w-5 overflow-hidden align-top"></div> @endif @elseif($column['type'] === 'checkbox') @include('datatables::checkbox', ['value' => $result->checkbox_attribute]) @else <div class="px-6 py-2 whitespace-no-wrap text-sm leading-5 text-gray-900 table-cell @if($column['align'] === 'right') text-right @elseif($column['align'] === 'center') text-center @else text-left @endif"> {!! $result->{$column['name']} !!} </div> @endif @endforeach </div> @empty <p class="p-3 text-lg text-teal-600"> {{ __("There's Nothing to show at the moment") }} </p> @endforelse </div> </div> @unless($this->hidePagination) <div class="rounded-lg rounded-t-none max-w-screen border-b border-gray-200 bg-white"> <div class="p-2 sm:flex items-center justify-between"> {{-- check if there is any data --}} @if(count($this->results)) <div class="px-8 my-2 sm:my-0 flex items-center"> <select name="perPage" class="custom-select custom-select-sm form-control form-control-sm form-select block w-full leading-6 focus:outline-none" wire:model="perPage"> @foreach(config('livewire-datatables.per_page_options', [ 10, 25, 50, 100 ]) as $per_page_option) <option value="{{ $per_page_option }}">{{ $per_page_option }}</option> @endforeach <option value="99999999">{{__('All')}}</option> </select> </div> <div class="my-4 sm:my-0"> <div class="lg:hidden"> <span class="space-x-2">{{ $this->results->links('datatables::tailwind-simple-pagination') }}</span> </div> <div class="hidden lg:flex justify-center"> <span>{{ $this->results->links('datatables::tailwind-pagination') }}</span> </div> </div> <div class="flex justify-end text-gray-600"> {{__('Results')}} {{ $this->results->firstItem() }} - {{ $this->results->lastItem() }} {{__('of')}} {{ $this->results->total() }} </div> @endif </div> </div> @endif </div> </div> @if($afterTableSlot) <div class="mt-8"> @include($afterTableSlot) </div> @endif </div> ` for i, match := range re.FindAllString(str, -1) { fmt.Println(match, "found at index", i) } }

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 Golang, please visit: https://golang.org/pkg/regexp/