Regular Expressions 101

Order By

Filter by Flavor

Community Patterns

Search among 200 community submitted regex patterns...

-1

1 2 3...10

Community Library Entry

Regular Expression
Python

^[ \t]*((?P<label>([a-zA-Z_][a-zA-Z0-9_]*))[ \t]*:)?[ \t]*((?P<opc>[a-zA-Z]+)[ \t]*([ \t](?P<op1>[a-zA-Z0-9_\.\"]+)([ \t]*\,[ \t]*(?P<op2>[a-zA-Z0-9_]+))?)?)?[ \t\n\f\r\v]*(;.*)?$

Open regex in editor

Description

Returns 4 groups,

label = label used in the start, if any
opc = Opcode mnemonic if the line contains an instruction
op1 = first operand to mnemonic, if any
op2 = second operand to mnemonic, if any

If a value is absent, returns None. (Python does this)

Can be easily extended to 3 operand instructions by adding one more subgroup.

Line matching syntax

General syntax is -

LABEL:OPC OPERAND1,OPERAND2;Comment

where -
LABEL = (optional) 
OPC = (optional)
OPERAND1 = (optional, needs OPC)
OPERAND2 = (optional, needs both OPC and OPERAND1)
COMMENT = (optional)

Examples

this_is_a_label: MOV A, B ; Comments are also supported
; Comments start with semicolon
empty_line_with_only_a_label:
MVI A, 01H ; No label in start

Submitted by anonymous - 5 years ago

Order By

Filter by Flavor

Community Patterns

rtrtr

Match non self closing tags HTML/XML tags

Sustitución de espacios en blanco al final y al principio de una cadena.

Customer

image cid

lightsail cli scp argument parsing

Angular commit

jvm core dump grab

SuperJS: variable initializement

Find ip, link

Find ip and link full

Checks for PHP classes with namespaces that haven't been imported.

Regex for C-style assignments

recipes

Gateway plugins filename

Last Name & Comma Regex

getfreessimg

Celulares - Tamanho de tela

[229187] - Celular - Memoria Interna

[229187] - Celular - Tamanho de tela

Community Library Entry

Regular ExpressionPython

Description

Line matching syntax

Examples

Regular Expression
Python