$megatools --regex-explainer --client-side

Regex Visual Explainer & AST Token Breakdown

Deconstruct regular expressions into clear plain-English token explanations, lookarounds, capture groups, and quantifier breakdowns.

Regex Presets:

Regular Expression to Deconstruct

Interactive Token StreamClick any chip to highlight explanation

Step-by-Step Plain English Breakdown

#1^

Start of string anchoranchor

Matches the start of the string or beginning of a line in multiline mode.

#2[a-zA-Z0-9._%+-]

Character Set Class [...]character-class

Matches any single character listed in the set: a-zA-Z0-9._%+-

#3+

Quantifier +quantifier

Modifies preceding item: One or more times (1+). Greedy match.

#4@

Literal character '@'literal

Matches the exact character '@' (case-sensitive unless /i flag is set).

#5[a-zA-Z0-9.-]

Character Set Class [...]character-class

Matches any single character listed in the set: a-zA-Z0-9.-

#6+

Quantifier +quantifier

Modifies preceding item: One or more times (1+). Greedy match.

#7\.

Literal dot '.'literal

Escaped dot character matching a period literally instead of wildcard.

#8[a-zA-Z]

Character Set Class [...]character-class

Matches any single character listed in the set: a-zA-Z

#9{2,}

Exact Quantifier Range {2,}quantifier

Specifies allowed repetition count for preceding token: {2,}.

#10$

End of string anchoranchor

Matches the end of the string or line boundary.

$ cat tips.txt

RegExp AST Decompiler

How to Use

1Paste any complex regular expression pattern with flags (g, i, m, s, u)
2Review visual color-coded token chips (Anchors, Character classes, Quantifiers, Groups, Lookarounds)
3Read step-by-step plain English explanations of each token's matching behavior
4Copy formatted regex documentation report

Stats

Total AST Tokens:10 tokens

Quantifiers:3

Lookarounds / Groups:0

Pattern Validity:VALID REGEX

Tips

•Lookaheads (?=...) and lookbehinds (?<=...) assert conditions without consuming characters in the match result
•Non-capturing groups (?:...) optimize regex performance by avoiding memory allocation for unused backreferences
•Click on any visual token chip in the stream to jump directly to its detailed breakdown

Example

Input

^(?=.*[A-Z])\w{8,}$

Output

Start of string anchor -> Positive lookahead for uppercase letter -> 8+ word characters -> End of string

$ cat tips.txt

RegExp AST Decompiler

How to Use

1Paste any complex regular expression pattern with flags (g, i, m, s, u)
2Review visual color-coded token chips (Anchors, Character classes, Quantifiers, Groups, Lookarounds)
3Read step-by-step plain English explanations of each token's matching behavior
4Copy formatted regex documentation report

Stats

Total AST Tokens:10 tokens

Quantifiers:3

Lookarounds / Groups:0

Pattern Validity:VALID REGEX

Tips

•Lookaheads (?=...) and lookbehinds (?<=...) assert conditions without consuming characters in the match result
•Non-capturing groups (?:...) optimize regex performance by avoiding memory allocation for unused backreferences
•Click on any visual token chip in the stream to jump directly to its detailed breakdown

Example

Input

^(?=.*[A-Z])\w{8,}$

Output

Start of string anchor -> Positive lookahead for uppercase letter -> 8+ word characters -> End of string