Each browser's regex engine also has different internal optimizations.
每种浏览器的正则表达式引擎也有不同的内部优化。
When the regex engine matches an atomic group, it will discard backtracting positions that came with all tokens inside it.
当正则引擎针对最小组团进行匹配时，它会跳过组团内标记的回溯位置。
Given a regex and a datum, a regex engine yields whether the datum matches a pattern and, if a match was found, what matched.
给定一个正则表达式和数据，正则表达式引擎将得到数据是否匹配模式及匹配内容(如果找到匹配)等结果。
If the regex engine is given the word 'engineering', it will correctly match 'engineer'. The next word boundary, \ b, will not match.
如果把“engineering”拿去匹配，正则引擎会先匹配到“engineer”，但接下来就遇到了字词边界，b，所以匹配不成功。
If all possible paths through the regex have been attempted but a match was not found, the regex engine goes back to step 2 to try again at the next character in the string.
如果正则表达式的所有可能路径都尝试过了，但是没有成功地匹配，那么正则表达式引擎回到第二步，从字符串的下一个字符重新尝试。
One of the reasons I decided to develop XI now was to experiment with the new regular expression (regex) engine that's built into JDK 1.4.
我决定现在开发XI的原因之一是想要用已构建到JD K 1.4中的新的正则表达式(regex)引擎进行实验。
One of the reasons I decided to develop XI now was to experiment with the new regular expression (regex) engine that's built into JDK 1.4.
我决定现在开发XI的原因之一是想要用已构建到JD K 1.4中的新的正则表达式(regex)引擎进行实验。
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