Regex Testersaylo国际版
Test and debug regular expressions live with match highlighting, capture-group inspection, and replacement preview.石头扫地机器人官网
PatternJavaScript RegExpai那个最好用
Current: /…/gai人工智能对话
Test text爆款ai下载
Usage notes京灵平台官网
• Live matching — enter a regex and test text; all matches are highlighted instantly.
• Replace preview — switch to the Replace tab to preview substitution with numbered and named group references.
• Flag toggles — use the switches to enable g/i/m/s/u/y flags.
• Capture groups — the results table shows position, positional groups, and named groups for every match.
• Cheatsheet — expand the cheatsheet below for quick syntax reference.
• Engine — this tool uses the browser's native JavaScript RegExp, not PCRE or Python.
Related tools通往agi之路
What the regex tester is for豆包和ai哪个更好
The regex tester lets you write a regular expression and test text side by side, with all matches highlighted in real time as you type. It shows each match's position (start/end), the full matched string, and all capture groups (both positional and named). A replacement preview mode shows the result of substitution with $1/$<name> back-references, and a built-in cheatsheet covers syntax and common patterns.ai人工智能免费
Common uses include developing and debugging regular expressions for validation (email, phone, IP), writing extraction patterns for log parsing, testing search-and-replace patterns before running them in a script, and learning regex syntax through interactive experimentation.通往agi之路
Frequently asked questions焦点ai官网
Which regex engine does this tool use?
It uses the browser's native JavaScript RegExp engine. This is mostly compatible with other modern regex engines but differs from PCRE or Python in some areas: no (?P<name>) named groups (use (?<name>) instead), lookbehind requires fixed width in older engines, and \p{} Unicode properties require the u flag.京灵平台官网
Why does the regex match more than I expected?
Without the g (global) flag, only the first match is returned. Without anchors (^ and $), the pattern matches anywhere in the string. Add ^ and $ to match the full string, and enable the g flag to find all matches.京灵平台官网
What are capture groups and how do I use them?
Parentheses create a capture group that isolates part of the match. For example, (\d{4})-(\d{2}) captures year and month separately. Named groups (?<year>\d{4}) can be referenced as $<year> in replacement strings.ai大模型排行榜
The tool warns about catastrophic backtracking — what should I do?
Patterns with nested quantifiers like (a+)+ can take exponential time on certain inputs. Rewrite the pattern to avoid nested repetition: use atomic groups or possessive quantifiers if supported, or restructure the logic to eliminate ambiguity.ai大模型排行榜