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# Regex Tester
Dan's Tools

Powered By RegExr

Library

{{getLabel()}}

{{getLabel()}}

{{getStaticRating()}}

* * *

* * *

* * *

# Substitution

* * *

{{getIcon()}}{{getLabel()}}{{getDetail()}}

**Regex Tester is a tool to **learn**, **build**, & **test** Regular Expressions (RegEx / RegExp).**

* * *

- Results update in **real-time** as you type.
- **Roll over** a match or expression for details.
- **Save** & **share** expressions with others.
- Explore the **Library** for help & examples.
- **Undo** & **Redo** with {{getCtrlKey()}}-Z / Y.
- Search for & rate **Community** patterns.

Character classes

.

any character except newline

\\w \\d \\s

word, digit, whitespace

\\W \\D \\S

not word, digit, whitespace

\[abc\]

any of a, b, or c

\[^abc\]

not a, b, or c

\[a-g\]

character between a & g

Anchors

^abc$

start / end of the string

\\b

word boundary

Escaped characters

\\. \\\* \\\\

escaped special characters

\\t \\n \\r

tab, linefeed, carriage return

\\u00A9

unicode escaped ©

Groups & Lookaround

(abc)

capture group

\\1

backreference to group #1

(?:abc)

non-capturing group

(?=abc)

positive lookahead

(?!abc)

negative lookahead

Quantifiers & Alternation

a\* a+ a?

0 or more, 1 or more, 0 or 1

a{5} a{2,}

exactly five, two or more

a{1,3}

between one & three

a+? a{2,}?

match as few as possible

ab|cd

match ab or cd



##### Regular Expression

- JavascriptPCRE
- flags

##### Test String

##### Substitution

Expression Flags

* * *

ignore case (i)
global (g)
multiline (m)

extended (x)
extra (X)
single line (s)
unicode (u)
Ungreedy (U)
Anchored (A)
dup subpattern names(J)



#### Save this Regex

Name:  Description:
Save

#### Top Regular Expressions

Match string not containing string
Check if a string only contains numbers
Match elements of a url
Match an email address
Validate an ip address
Match or Validate phone number
Match html tag
Match dates (M/D/YY, M/D/YYY, MM/DD/YY, MM/DD/YYYY)
Empty String
Checks the length of number and not starts with 0
Match a valid hostname
Not Allowing Special Characters
Validate datetime
string between quotes + nested quotes
Match brackets
Url
match a wide range of international phone number
Match IPv6 Address
email validation
RegEx Allowing Number Only

#### Cheat Sheet

Character classes

.

any character except newline

\\w \\d \\s

word, digit, whitespace

\\W \\D \\S

not word, digit, whitespace

\[abc\]

any of a, b, or c

\[^abc\]

not a, b, or c

\[a-g\]

character between a & g

Anchors

^abc$

start / end of the string

\\b

word boundary

Escaped characters

\\. \\\* \\\\

escaped special characters

\\t \\n \\r

tab, linefeed, carriage return

\\u00A9

unicode escaped ©

Groups & Lookaround

(abc)

capture group

\\1

backreference to group #1

(?:abc)

non-capturing group

(?=abc)

positive lookahead

(?!abc)

negative lookahead

Quantifiers & Alternation

a\* a+ a?

0 or more, 1 or more, 0 or 1

a{5} a{2,}

exactly five, two or more

a{1,3}

between one & three

a+? a{2,}?

match as few as possible

ab|cd

match ab or cd



# 
# Regex Tester

Regex Tester isn't optimized for mobile devices yet. You can still take a look, but it might be a bit quirky.

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# 
# Regex Tester

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